WRVY769 Posted August 12, 2023 Report Share Posted August 12, 2023 Would I notice a difference from a 6db gain antenna to a 12db gain antenna I live near some minor hills and quite a bit of trees. Quote Link to comment Share on other sites More sharing options...
Sshannon Posted August 12, 2023 Report Share Posted August 12, 2023 27 minutes ago, WRVY769 said: Would I notice a difference from a 6db gain antenna to a 12db gain antenna I live near some minor hills and quite a bit of trees. Absolutely, but whether the difference is positive or negative depends entirely on all the other variables Quote Link to comment Share on other sites More sharing options...
WRVY769 Posted August 12, 2023 Author Report Share Posted August 12, 2023 what is some of the other variables. sorry I don't know very much about dB gain and antenna. Quote Link to comment Share on other sites More sharing options...
Sshannon Posted August 12, 2023 Report Share Posted August 12, 2023 3 minutes ago, WRVY769 said: what is some of the other variables. sorry I don't know very much about dB gain and antenna. So a 12 dB gain is simply more focused in some directions. As an example it might not hear signals that are above, below, or to the sides or rear of it, while a 6 dB antenna is usually more receptive throughout a wider swath. Study the propagation patterns of the antennas you’re looking at. Many commercial antennas have less gain in order to be less directional. WRYF638 and WRUU653 2 Quote Link to comment Share on other sites More sharing options...
WRVY769 Posted August 12, 2023 Author Report Share Posted August 12, 2023 this is the antenna. it's a vertical is there a way to direct the patterns in one direction. Comet Antennas GP-9NCA Comet GP-9NCA GMRS/FRS-Commercial Dual Band VHF/UHF Base Vertical Antennas | DX Engineering Quote Link to comment Share on other sites More sharing options...
Sshannon Posted August 12, 2023 Report Share Posted August 12, 2023 9 minutes ago, WRVY769 said: this is the antenna. it's a vertical is there a way to direct the patterns in one direction. Comet Antennas GP-9NCA Comet GP-9NCA GMRS/FRS-Commercial Dual Band VHF/UHF Base Vertical Antennas | DX Engineering No, that’s a different type of antenna. The most common antenna used to direct RF in a given direction is called a Yagi-Uda antenna. That’s a good antenna though. But as some reviewers point out it has a fairly flat pattern. https://www.eham.net/reviews/view-product?id=2455 Quote Link to comment Share on other sites More sharing options...
WRVY769 Posted August 12, 2023 Author Report Share Posted August 12, 2023 Would I receive a directed signal or more of a open signal with this antenna. Quote Link to comment Share on other sites More sharing options...
WRVY769 Posted August 12, 2023 Author Report Share Posted August 12, 2023 what does it mean by is has fairly flat pattern? Quote Link to comment Share on other sites More sharing options...
Sshannon Posted August 12, 2023 Report Share Posted August 12, 2023 Just now, WRVY769 said: Would I receive a directed signal or more of an open signal with this antenna. Let me see if I can find a video that explains. This is more than I can explain one question at a time and still get to bed tonight. I’ll be back. Quote Link to comment Share on other sites More sharing options...
Sshannon Posted August 12, 2023 Report Share Posted August 12, 2023 5 minutes ago, WRVY769 said: what does it mean by is has fairly flat pattern? Like a pancake. The signals go mostly horizontal instead of spreading up and down. Quote Link to comment Share on other sites More sharing options...
Sshannon Posted August 12, 2023 Report Share Posted August 12, 2023 3 minutes ago, Sshannon said: Let me see if I can find a video that explains. This is more than I can explain one question at a time and still get to bed tonight. I’ll be back. WRUU653 and WRYF638 1 1 Quote Link to comment Share on other sites More sharing options...
WRVY769 Posted August 12, 2023 Author Report Share Posted August 12, 2023 I will take a look at this and thank you for all your help. 73 Quote Link to comment Share on other sites More sharing options...
Sshannon Posted August 12, 2023 Report Share Posted August 12, 2023 Antennas are the most interesting subject in radio. Enjoy the video. There are lots of good videos out there. WRUU653 1 Quote Link to comment Share on other sites More sharing options...
KAF6045 Posted August 12, 2023 Report Share Posted August 12, 2023 16 hours ago, WRVY769 said: what does it mean by is has fairly flat pattern? Ignore the frequency and free-space titles (though the first IS a halfwave in free space) This is the pattern of a half-wave dipole in free space. It has 2.16 dB gain over an isotropic emitter. These are over (as I recall -- old images) "perfect ground" at two different heights. Note the reduced gain. A high gain vertical antenna will squeeze those patterns into much narrower "beams". Depending upon how high it is mounted, and surrounding terrain, your narrow high-gain beam may just be hitting lots of trees and hills, while a lower gain might go a bit above said terrain. This is an antenna over "real ground" -- note the near 7dBi gain, but also note the elevation angle it occurs at. Quote Link to comment Share on other sites More sharing options...
fremont Posted September 15, 2023 Report Share Posted September 15, 2023 6 dB is one S unit..... just sayin' Quote Link to comment Share on other sites More sharing options...
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