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It’s very similar to the Extremetenna CM-4228HD, except that it features a lower range and zero support for VHF signals.

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The Channel Master Ultratenna CM-4221HD is a 4-Bay UHF/HD outdoor TV antenna that can pick up high-quality signals from all six CEA zones, including yellow, green, light green, red, blue, and violet. It’s very similar to the Extremetenna CM-4228HD, except that it features a lower range and zero support for VHF signals. It comes un-assembled, but can easily be mounted and installed onto a traditional antenna mast. Included also is a 75ohm PC balun built directly into the antenna. Signature to the CM-4221HH is that it provides a superior UHF gain of 10.2dB.

Features
  • 4-Bay UHF/HD TV Antenna
  • Outdoor Use
  • Yellow Zone
  • Green Zone
  • Light Green Zone
  • Red Zone
  • Blue Zone
  • Violet Zone
  • Channels 14-69
  • Superior UHF Gain
  • High Quality Reception 
Specifications
  • Channels: 14-69
  • Range: 45 Miles
  • Signals: HD/UHF
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