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KB9VBR Slim Jim GMRS Antenna versus Ed Fong DBJ-UHF GMRS Antenna


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  • 2 weeks later...
  • 2 weeks later...

Also, just read this on digi.com. Any comments to this?

"Also note that antennas with higher gain focus the energy over a smaller area. Digi recommends avoiding the highest gain antennas in most applications because they are more difficult to work with.
Recommended antenna gains:

  • Omnidirectional: 3 dBi to 6 dBi
  • Directional: 8 dBi to 11 dBi
    Note: High gain antennas are of limited use in extending the range in a non-Line-of-Sight (non-LOS) environment. In a non-LOS environment the obstructions contribute more losses to the system than the antennas are able to overcome. Also, the obstructions cause the signals to bounce and arrive at the antenna from different angles so it is desirable to have an antenna with a wide beam width and a lower gain.
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4 minutes ago, WSEN982 said:

that'd be dbi - thanks for catching.

What Digi said is exactly right. Gain in one direction is stolen from somewhere else. 
What are you using the antenna for?  Do you expect to turn it to point in a particular direction, such as pointing it at different stations? Or do you want to just receive every station in a circle around you? Wil they all be at the same level as you or will some be higher and some lower?

Personally I’m satisfied with a 6 dBi gain antenna on my roof. The repeater that’s 3000 ft higher is still easy to reach. 

 

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