Channel Master 3671

Long-range outdoor rooftop HDTV and FM antenna

  • Channel Master 3671


Item #: 6593671
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Our take on the Channel Master 3671

by Steve Kindig
Channel Master

If your goal is to receive distant TV stations, Channel Master's 3671 is designed for "deepest-fringe" situations — it succeeds where lesser antennas fail. It receives digital over-the-air TV signals in the UHF and VHF bands, and can also be used for FM radio — enjoy your favorite network shows without paying for satellite or cable TV. Part of their high-performance Crossfire series, the 3671 is the highest-gain antenna Channel Master has ever made.

This antenna features a highly directional design that will provide best results when most or all of the desired stations are transmitting from the same location. For maximum reception, pair the 3671 with Channel Master's 7777 preamplifier. Also, if you'd like to pull in signals from different areas, consider a rotor to aim your antenna in the right direction.

Read more

The 3671 is classified as a Large Directional antenna. This is a very large antenna that is suitable for roof and attic installations with sufficient space (mast recommended). For tips on selecting an antenna, and links to websites that help you locate HDTV signals in your area, check out our article on choosing and installing an antenna for HDTV.


  • receives UHF and VHF TV channels 2-69, plus FM
  • range is 60+ miles for UHF (ch. 14-69), 100+ miles for VHF (ch. 2-13)
  • rugged double boom design with 61 elements
  • 173"L x 110"W x 35-1/2"D
  • 95-3/4" turning radius (if used with an antenna rotor)
  • 75-ohm output for coaxial cable (RG-6 cable is recommended)
  • accommodates 1-1/4"-1-1/2" mast (mast not included)
  • warranty: 3 years
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Product Research
What's in the box?

Download owner's manual

  • Antenna assembly (3 pieces)
  • 2 U-bolt and nest assemblies
  • 2 Aluminum harnesses (Length=13")
  • Black plastic spacer
  • 75-300 Ohm Matching Transformer balun
  • 3 M5 x 35mm bolts (Slotted/Phillips-head)
  • 11 M5 wing nuts
  • Clip-on cable guide
  • Dipole Assembly Instructions
  • Antenna Instruction Sheet
  • Electric wire danger warning and antenna mounting instructions (English/Spanish)
  • Electrical wire danger warning sticker

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 open the box, verify contents, 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.


Overview: The Channel Master Model CM-3671 is a large outdoor TV antenna that will receive both digital TV and HDTV programming. It offers superior signal strength, and is recommended for antenna reception markets where TV signals are weak to strong. In weak reception areas, you should use an antenna booster in conjunction with the antenna.

Reception Range: This HD antenna receives the UHF, VHF and FM bands (channels 2 through 69) with a reception range of approximately 100 miles.

Construction: The CM-3671 has 61 elements, arranged in a double boom design. The antenna comes in three pieces, plus hardware, requiring extensive assembly. A majority of the elements must be unfolded when mounted.

Mounting: The antenna comes with two U-bolt mounting assemblies for secure mounting to an antenna mast. It can be mounted on a roof, wall, chimney, in an attic, or on a tripod. The manufacturer's suggested height is 5-10 feet above the roof line.

Turning Radius: The Model 3671 has a 95-3/4" turning radius. If using an antenna rotor, you must make sure there are no obstructions around the antenna mast that would interfere with the antenna's rotation.

Connections: The included 75-ohm matching transformer will need to be connected to the antenna tap-off points using the included wing nuts. The other end of the transformer has a female F-type connector. The included waterproof rubber weather boot should be installed over the cable connection to guard against corrosion.

Note: Coax cable is not provided; RG-6 is recommended.

Grounding: The antenna and mast should be properly grounded. Grounding provides lightning protection for the antenna and your TV set. A #8 or larger aluminum or copper wire connected between the antenna and grounding rod should be used. In addition, the Channel Master Grounding Block (item 6593274) is recommended for grounding the coaxial transmission lines.

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For a more in-depth review and enhanced detailed information on the Channel Master 3671, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_6593671/Channel-Master-3671.html ).