Channel Master 7778

Medium-gain mast-mount UHF/VHF TV antenna preamp

Item #: 6597778

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The 7778 is part of Channel Master's high-performance Titan 2™ series of mast-mounted preamplifiers. Its low-noise, medium-gain design can solve a number of reception problems, and is especially effective for long-range "deep-fringe" applications used in combination with Channel Master's 4228 antenna. (See our article on Choosing & Installing an HDTV Antenna.)

Two-piece mast-mounted preamplifiers have an advantage over more typical one-piece in-line units because the amplifier module is mounted near the antenna itself, to eliminate amplification of any noise or interference in your coax cable. A preamplifier can improve reception whether the problem is weak signal strength at your antenna, or loss of signal quality due to a long cable run between your antenna and TV.

Installation is simple: run a length of RG-6 cable from your antenna to the 7778's amplifier module, and another RG-6 cable from the amp to the 7778's power supply. Power is provided to the amplifier via the RG-6 cable, so no other wiring is necessary, and the power supply can be placed indoors to avoid exposure to the elements. Finally, run a length of RG-6 from the power supply either directly to your TV, or to a video distribution hub.

Product Highlights:

  • two-piece design with separate mast-mounted amp module and power supply
  • medium-gain, low-noise operation for deep fringe reception
  • compatible with both digital and analog TV signals
  • separate amplification for VHF (channels 2-13) and UHF (channels 14-51)
  • VHF gain: 16 dB, VHF noise: 3.0 dB
  • UHF gain: 23 dB, UHF noise: 2.2 dB
  • filtering for rejection of out-of-band signals
  • switchable FM trap (allows FM reception)
  • 75-ohm input and output
  • built-in lightning and surge protection
  • shielded die-cast aluminum housing
  • warranty: 90 days
  • Our 60-day money-back guarantee
  • mast not included
  • RG-6 cable is recommended

Hands-on research

What's in the box?

Download owner's manual

  • CM-7778 Mast-mounted antenna preamplifier
  • AC/DC adapter (APA1260315U indoor power supply)
  • Power Inserter (PCT-MPI-1G)
  • 6' Coaxial cable (with threaded "F" connectors on each end)
  • Large waterproof weather boot (for connection at antenna)
  • 2 Small waterproof weather boots (for connections at preamplifier)
  • U-bolt Assembly (with 2 star-washers and 2 hex nuts attached)
  • 1 Self-tapping screw (for mounting power inserter)
  • Instruction sheet (Eng/Span/Fren)
  • Technical support contact sheet

Product Research


Overview: The Channel Master Titan 2 Model CM-7778 Mast Mounted Antenna Preamplifier provides amplification for HD and digital signals received by your antenna. Preamplifiers can also be used when distributing the antenna signal to multiple TVs, as splitters reduce the signal strength at each output. The preamplifier comes with an indoor power supply, which connects via coaxial cable.

Signal Gain: The CM-7778 is a medium gain, low noise preamplifier to be used in moderate signal areas to boost the antenna signal to a viewable strength. The preamplifier provides 16 dB of signal gain on both VHF and UHF bands, at frequencies between 54 MHz and 1000 MHz.

Note: For areas with weak signal strength, where ALL broadcast towers are 80+ miles away, the CM-7777 High Gain Preamplifier may be recommended.

Switchable FM Trap: The amplifier has an FM trap to block FM signals to prevent them from interfering with the TV signal. If you wish to unblock the FM signals, you will need to remove the cover, held in place by 4 Phillips-head screws, and set the switch to "Out".

Case: The CM-7778 features a rugged, outdoor-rated housing that can withstand temperatures up to 140°F. The preamplifier mounts to the antenna mast with the supplied U-bolt assembly just below the antenna. The unit mounts with the connections facing downward to keep moisture out of the housing and the connections dry.

Note: The preamplifier and supplied U-bolt assembly are designed for use with antenna masts up to 1-3/4" in diameter.

Connections: The CM-7778 has two F-type 75-ohm connections at the preamplifier: a combined VHF/UHF input, and an output/power connection. The indoor power supply (AC adapter) connects via coaxial cable, and includes a power inserter to energize the mast-mounted amplifier along the cable.

Dimensions (Preamplifier):

  • Width: 4.904"
  • Height: 2.54" (without cables connected)
  • Depth: 3.733"

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Channel Master 7778 Reviews

Average Customer Review:

6 reviews
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Channel Master 7778

Written By JG, North Smithfield, RI on Monday, September 22, 2014

Crutchfield Customer Review (What's this?)

The first one I received was DOA. I wish they would have tested it before leaving the factory-it would have saved me a ton of trouble shooting. The second one worked gaining me a few channels and strengthening a few of the weaker ones.

Pros: gained a few channels strengthened a few weak channels. east to install

Cons: first one was dead-makes me wonder about quality

Good product

Written By Steve, Barboursville, Va. on Sunday, July 13, 2014

Made all the difference in getting consistent signal from stations about 30 miles away.

Pros: Good product and great Crutchfield service.

Cons: None at this time.

Works great

Written By Rathrbcruisin, Adrian mi. on Tuesday, October 15, 2013

Crutchfield Customer Review (What's this?)

Used this with a new channelmaster antenna and i am getting channels in clear HD. I use this and a rotator and i'm getting channels from detroit toledo and lansing. I did some reviews and this rated very high. If you dont need the more powerful amp dont get it this one works great.

Pros: Cost

Cons: None


Written By Todd, Texas on Thursday, October 03, 2013

Crutchfield Customer Review (What's this?)

Not hard to install, and did the job I needed it to do.

Pros: It did what y'all said it would do.

Cons: None

works, But

Written By James, Disputanta, VA on Saturday, August 15, 2009

Crutchfield Customer Review (What's this?)

There is no doubt this pre amp works. I havn't had to use a pre amp for sometime, but though this would help reception, and it did. One thing to mention is that I am also using a distribution amp to send the TV signal to the rest of the house and a garage. At first all went well, but after a day or so the signal strength fell off quite a bit. The answer was to lower the gain of the distribution amp. I don't understand why this did not show up right away.... Also I was dissapointed in the manual that came with the product.

Some improvement

Written By Rob, Eagle, WI on Monday, August 11, 2008

Crutchfield Customer Review (What's this?)

Did improve analog reception and digital reception noticeably.

Digital still could be boosted some more for consistent reception.

I am 30 miles from TV stations

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