Riktar Posted June 26 Report Share Posted June 26 19 hours ago, GreggInFL said: Being new to GMRS I'm hoping to eventually collect HTs, a mobile and a base station/repeater. I have the HTs and am looking at a mobile with a mag mount antenna, which will be a lot shorter than the Comet. This is the combo I'd like to test in the attic; curious how much attenuation will occur. Yeah, my attic, like most, is too short for the Comet so it will eventually go outside. Be aware that most mag mount moble antennas use the vehicle chassis as a ground plane. If you experiment with this make sure you have some type of 'groundplane' to attach the mag mount to. A large baking pan or pizza pan should suffice. I don't recall the minimum diameter you should use but I am pretty confident a 12" pizza pan should work. Quote Link to comment Share on other sites More sharing options...
dosw Posted June 26 Report Share Posted June 26 2 hours ago, Riktar said: Be aware that most mag mount moble antennas use the vehicle chassis as a ground plane. If you experiment with this make sure you have some type of 'groundplane' to attach the mag mount to. A large baking pan or pizza pan should suffice. I don't recall the minimum diameter you should use but I am pretty confident a 12" pizza pan should work. A 1/4 wavelength at 462MHz is a touch under 6.4 inches. Any ground plane is better than no ground plane, I imagine, but using a 14 inch pizza pan would be better. Quote Link to comment Share on other sites More sharing options...
GreggInFL Posted June 26 Report Share Posted June 26 6 hours ago, WRQW589 said: A 1/4 wavelength at 462MHz is a touch under 6.4 inches. Any ground plane is better than no ground plane, I imagine, but using a 14 inch pizza pan would be better. Found a 16" pizza pan and a Nagoya UT-72G. Time to hit the attic (which must be 140*). Quote Link to comment Share on other sites More sharing options...
Riktar Posted June 27 Report Share Posted June 27 3 hours ago, GreggInFL said: Found a 16" pizza pan and a Nagoya UT-72G. Time to hit the attic (which must be 140*). I went through this a few summers ago in my former residence. It was 120+ degrees and I spent almost a whole day (This place had a BIG attic) finding the best position to put my antenna. Felt like I sweated a gallon of water before the day was through. Good Luck! GreggInFL 1 Quote Link to comment Share on other sites More sharing options...
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