Channel Master 9521A

Remote control antenna rotor

Item #: 6599521A

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For optimum reception of TV signals from more than one direction, it's hard to beat the combination of a good mid-range or long-range directional antenna and an antenna rotor like Channel Master's 9521A. This sturdily-built design can handle wind and weather for rooftop installations, and works great with attic-mounted antennas, too. You'll love the convenience of being able to control your antenna with pinpoint precision without leaving your chair.

The 9521A has three parts: the rotator motor, controller unit, and wireless remote control. The rotator unit attaches to your antenna mast, and a special 3-conductor wire connects the rotator to the controller unit (controller wire is not included). The controller unit is located indoors, away from the elements, typically near your TV. It has a digital display for channel and diagnostic info, and includes an AC power supply that powers the 9521A system. The supplied remote control is easy to use, and this system can also be operated using many universal remotes.

Product Highlights:

    Rotor unit
    • heavy-duty rotator motor
    • cast-aluminum housing
    • mounts to antenna mast (max. mast diameter 2")
    • 9-3/8"W x 10-5/16"H x 4-5/8"D
    Controller unit
    • auto synchronization ensures accurate positioning
    • direct access via channel number or compass location
    • digital channel display
    • 69-channel programmable memory
    • compatible with most universal remotes
    • includes wall-plug AC power supply
    • control wire not included
    System specs

    Channel Master 9521A Reviews

    Average Customer Review:

    22 reviews
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    channel master 9521A

    Written By Paul O., Illinois on Wednesday, October 21, 2015

    Crutchfield Customer Review (What's this?)

    Very good product; easy to install and works very well. Much better quality than the rotor I had before.

    Max Michigan

    Written By Spartan, Michigan on Friday, October 02, 2015

    This product replaced an inferior product of a different company. It was very easy to install and program. It is on a 40' tower with a large antenna. It is holding position even in high wind. I would recommend this product.

    Great buy

    Written By Hutt, Michigan on Sunday, September 20, 2015

    Crutchfield Customer Review (What's this?)

    Great product. I would recommend it

    Channel Master 9521A

    Written By Frank L, Fawn Grove PA. on Saturday, July 18, 2015

    Best set-up I have had in 20 years

    Pros: Very easy use

    Cons: None

    Need 2 antenna masts

    Written By GH, Michigan on Monday, May 25, 2015

    Crutchfield Customer Review (What's this?)

    It was easy to set up. It worked. A separate 2-3 foot antenna mast is needed. After receiving an antenna, antenna mast, chimney mount, and the antenna rotator, it was apparent that an additional mast was needed to attach to the rotator. I purchased a 4 ft RCA antenna mast extender and cut shorter. The RCA mast was kind of flimsy and deformed when I tightened the U bolts. The antenna mast from Crutchfield is more durable and would have worked better. I did not want to wait, so I bought the 2nd mast at a local hardware store. This is not a problem with the rotator itself so I gave it 5 stars.

    Pros: Works. Not too hard to set up.

    Cons: Had to buy a second antenna mast.

    Channel Master 9521

    Written By Anonymous, Ohio on Wednesday, March 25, 2015

    Crutchfield Customer Review (What's this?)

    This is very high quality with easy installation and straight forward instructions.

    Pros: Seems to fit most common mast sizes

    channel master 9521A

    Written By Arthur, Ogden , Il on Monday, March 16, 2015

    Crutchfield Customer Review (What's this?)

    works just fine

    Pros: nice unit

    Cons: none

    Works well

    Written By SylviaS, Fayetteville, NC on Thursday, March 12, 2015

    Crutchfield Customer Review (What's this?)

    set up channel master antenna with rotor, amp, preamp & dvr...get 40 channels on chimney mount, 1 story house...old neighborhood with many large trees obstructing signal. Pixelation during bad weather & hard to zero in northern stations due to curvature of the earth, southern stations are more clear. Can zero in stations with the remote that goes with the rotor box. DVR has all the features of a cable/satellite dvr, could have an extra tuner that only watches channels but does not record. If you record 2 shows at the same time you can't watch a third, 1tb storage & can connect external drives only if not recording.

    Pros: Turns by degree to zero in on stations

    Cons: skips some degrees while trying to pull in station

    Rotator is a great idea but doesn't last

    Written By Subaru Lou, New Jersey on Wednesday, December 31, 2014

    Crutchfield Customer Review (What's this?)

    Crutchfield was great in sending a replacement rotator when the first one we purchased stopped working. After less than a year of the replacement being near the roof, it stopped working too. Because two failed, each in short time, I would not recommend this unit. It appears that the black rubber gasket wears quickly, possibly allowing moisture into the unit causing it to fail. We did not rotate the antenna often but that did not translate into working for a long time. The only reason I give 2 stars instead of 1 is that the rotator worked well for a little while and when it did work it worked well.

    Pros: Cool that it rotates the antenna to different positions. Relatively easy to set up. Mast mounts easily into unit.

    Cons: Not made to last. Two units failed with a year of each other. Rubber gasket wears quickly.

    Chanel Master Rotor

    Written By SamM, Concord NC on Friday, August 02, 2013

    Crutchfield Customer Review (What's this?)

    The Chanel Master Rotator is the finishing touch for Antenna reception. It allows for fine tuning distant stations.

    Works well

    Written By Pmgrnvl, Greenville SC on Sunday, January 27, 2013

    Crutchfield Customer Review (What's this?)

    Seems to perform well. Would have given it a higher rating except one of the controls on the main control box doesn't work (it does via the remote). A little shocked to find there's not much protecting the motor. When you open up the housing to connect the cable, the motor's guts are clearly visible. Works well, but I am not sure about the longevity of this product.

    Pros: Works well, easy to use (once you figure out the setup).

    Cons: Seems cheaply made in some spots.

    Channel Master 9521A Remote control antenna rotor

    Written By Fred, Kannapolis, NC on Friday, June 08, 2012

    Crutchfield Customer Review (What's this?)

    Works very well, smooth operation, silent operation.

    Pros: simplicity of use, accuracy

    Cons: none

    The 9521A was easy to install and works perfectly!

    Written By WJ, Denver, CO on Tuesday, May 29, 2012

    Crutchfield Customer Review (What's this?)

    Just what I needed to enjoy FREE HD signals on my new HD TV.

    Pros: Worked perfectly as advertised. But the best part was the programming capability to match antenna direction with the channel number. It is quick and simple to set and makes it so easy for anyone in the family to set the antenna for best reception.

    Cons: Can only adjust unit in one room, but only have to readjust antenna for some channels. I found a setting where the most channels come through and leave it there

    Failed as expected, but works great now!

    Written By K, Reading, PA on Wednesday, May 23, 2012

    Crutchfield Customer Review (What's this?)

    This is a sturdy, well-built unit that has more than enough power to handle my 85" VHF-Hi/UHF deep fringe antenna. Right out of the box, the rotor worked exactly one time. After that, the motor did not turn at all. Fortunately, I had read similar complaints on various websites, so I knew what to do. The solution: completely disassemble the unit, degrease all the gears with mineral spirits, regrease liberally with a quality synthetic grease, and oil the motor bearings. Also, the rubber weather bushing fits ery tightly and puts undue excess strain on the motor... greasing it will eliminate this problem and add to it's weatherproofing functionality. I have been using this unit heavily for one week now (I have DTV numerous DTV stations in 6 clusters from 3 degrees to 280 degrees and switch between them frequently throughout the day. So far, so good.

    Pros: Very easy to hook up. The remote and numeric display make it easy to reaim the antenna when switching to a different DTV station, to "fine tune" antenna position as signals fade, and to shake birds off the antenna! The motor is very quiet -- I have it mounted to the wall framing of my single-story home right above the living room and can not even hear it through the walls.

    Cons: Needs considerable work initially to get it working as it should... not for the novice! The control box and remote are not the highest of quality or craftsmanship, but they do the job.

    Works well

    Written By Chas, Valparaiso IN on Sunday, April 17, 2011

    Crutchfield Customer Review (What's this?)

    Works as advertised. Instruction manual not the best. Still have not figured out how to re-synchronize.

    Channel Master 9521A

    Written By Lynn N, Georgia on Tuesday, April 05, 2011

    Crutchfield Customer Review (What's this?)

    We had this remote control rotor hooked up in no time. It works great and it is so
    nice not having to jump up every time and turn the antenna. Would definitely give
    this product a thumbs up!

    Remote control a nice touch

    Written By Malone22, Lake Forest, Illinois on Sunday, March 20, 2011

    Crutchfield Customer Review (What's this?)

    Very impressive, Pre-setting the 69 locations is a little confusing and tedious
    though. Of course you have to do that only once. Because the memories are
    retained even after a power outage
    To the person who said the control box was cheap and flimsy, I me
    it's a testament to new technology ie sleek and easy to place.
    I use it with my Tivo's which has antenna connections and has a feature that
    shows you the signal strength of digital signals then you can change the
    direction until you get the best signal. I am using the Channel Master 3020
    antenna..I use it for fm and when the cable goes out. I also use it for exclusively
    for one of my Tivo's becuase I don't want to pay for another cable card.

    Non functional remote control

    Written By Bill, Hauppauge, NY on Monday, May 03, 2010

    I purchased and install this rotor and the HD antenna a few years back and they still work very well for the application. I get only a fair amount of signals due to my lower elevation not due to this product. The signals I do receive are crystal clear and sharp. I have also noticed the same antenna used at my local store for their HDTV displays. Of course theirs is on top of a tower. Unfortunate for me I must at times rotated my antenna to capture different broadcasts and it does perform well. Being a remote control buff, I am sorry to say that the remote control that came with this rotor never worked and to turn my antenna I have to manually push the buttons on the fragile made cheap in China motor rotators to turn the antenna. I give the rotor and the antenna 5 stars for never failing to function through even the frozen days of winter. But the cheap ass remote control never worked.

    Channel Master 9521A

    Written By Dave, Morristown, NJ on Monday, February 11, 2008

    Crutchfield Customer Review (What's this?)

    Definitely an improvement to the old rotor we had. Works quickly, and is easy to re-calibrate.

    It's not your father's antenna rotor

    Written By Scott, Danville, VA on Sunday, November 11, 2007

    Crutchfield Customer Review (What's this?)

    I expected the big old clunky box that I remember on top of our TV when I was a kid. The size of the roof mounted unit was about what I remember, but the control unit is about the size of a small LED alarm clock. It fits nicely under the edge of the TV pedestal and disappears from sight when it times out or you hit the power button on the remote and the display goes blank.
    Ah, yes, the remote. No more having to get up from the recliner to reposition the antenna because you changed channels. Also, the remote allows you to fine tune the antenna 1 degree at a time while watching the signal meter on your TV or satellite DVR (if equipped with an OTA antenna input).
    Once you finish fine tuning, enter the settings into memory, either by channel number or by degree heading. Then just push the channel number on your TV remote and the same number on your antenna remote.
    Installation is also simplified now by use of spring terminals for the wiring, both at the controller and the roof unit. This unit uses only three wires instead of four like the old ones.

    antenna system

    Written By Tim, Pittsburgh, PA on Wednesday, October 10, 2007

    Crutchfield Customer Review (What's this?)

    I installed this rotor, 4228 UHF antenna, and the 777 preamplifier in my attic I had a 20 element VHF antenna that I have fixed mounted in the attic also ( tied to roof rafters) The UHF antenna is rotated and goes to the UHF antenna input and the VHF antenna goes to the VHF only input of the preamp in the attic. The signal goes to the cellar via RG6 to the power supply and to a 4 way splitter for 2 HD tv's and 2 vhf/uhf analog tv's. The preamp takes care of splitter loss and roof loss thru shingles( mine are fiberglass). I receive currently 12 HD tv stations + 10 vhf only (close stations) all perfect with this set up. I use this as ALL of my tv signals and NO monthly cable fees for this reasonably priced system.

    easy to install, works great

    Written By JOhn, Baltimore, MD on Saturday, October 07, 2006

    very easy to install, i installed with a new antenna to get hd over the air signals. Works great

    Hands-on research

    What's in the box?

    Download owner's manual

    • Rotor
    • Controller
    • AC power supply
    • Wireless remote
    • 2 "AAA" batteries
    • Installation and operation instructions

    Product Research


    Overview: A Rotor or Rotator is a mast-mounted, motor-driven device that permits you to conveniently rotate (orient) the outdoor antenna in any direction to optimize reception of a desired TV channel. A rotor should be considered when TV signals are being broadcast from towers in different directions and a single antenna cannot accommodate all locations. The rotator consists of two parts; an indoor control unit and an outdoor drive unit. The two are connected via a 3-conductor wire that carries the voltage and control signals.

    Note: The control unit for the Channel Master 9521A is not backwards compatible with any of the older Channel Master rotors.

    Direction: The compass heading (direction) you want the antenna to point can be entered directly using the included remote, or you can scroll to the correct heading using the up and down buttons on the control unit (example: 90° to point east, 225° to point south-west, etc).

    Programmable: You can program 69 antenna locations (1-69), corresponding to 69 over the air broadcast frequencies. This way the antenna direction preset number can be the same as the channel number. The non-volatile memory will hold your programmed locations during a power failure.

    Synchronize: After moving back and forth many times, a mechanical device can become misaligned with its electrical controller. At any time you can Synchronize the drive unit and control unit. To realign, the motor turns fully counter clock wise and calibrates that direction to 0° (the orientation of the drive unit is fixed at installation). If you prefer, auto synchronization can be turned on and the system will realign itself after each 50 direction movements.

    Drive Unit: The drive unit uses a heavy duty motor in a one-piece cast aluminum housing with a durable powder coat painted finish. It uses a precision cut gear system, built-in steel thrust bearings, and has wind-tested brake pads.


    • Rotation: 1 RPM
    • Gear Ratio: 3200 to 1
    • Maximum Mast Diameter: 2 inches
    • Maximum Vertical Load: 250 pounds
    • Maximum Balanced Wind Load Area: 3 square feet
    • Operating Voltage: 117 volts AC/60 Hz (rotator and control unit)

    Our Product Research Team

    At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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