![]() ![]() Changing the physical location (horizontally and/or vertically) may make a difference. These could very well be losses caused by many obstructions in the signal path and reflections caused by the environment. Given that pickup is touchy in the garage and that you are also having communications using the antenna on the roof, there are other factors that coming into play. 14 miles with truly a clear shot should result in very good strength (perhaps 40dB of more to spare), and with minimal effect from the environment. Your situation suggests that you may not have the “clear shot to that repeater” you suggest. The other photo is the view from my roof and that repeater is over in that direction How can that mobile, inside my garage pick it up but the roof mounted one can't? Could it be that cable or maybe the connectors? I made a PVC "C" to hold the Slim Jim (I attached a photo - the other antenna in photo is my 2m/440 Comet GP-6) I think I may eventually just get a Comet CA-712EFC. I bought a GMRS specific Slim Jim, mounted on my roof, with a clear shot to that repeater, which is about 14 miles away and it will not pick up that same repeater at all. If I move it even a foot, I can't hear the repeater, but in that one specific spot, it picks up great I am using it inside my garage, on a vehicle and it needs to be in a very specific spot to hit the one repeater I'm using. I was (and still am) using a mobile Nagoya UT-72g and although it works, it's very touchy as to it's position. I would be least likely to do the last option I listed because you will still be susceptible to drastic SWR changes with wet weather. I would recommend fiberglass rods, wood, or use an antenna analyzer to verify and set the antenna length to account for the capacitance created in the loop, introduced by the PVC. The PVC at the top and bottom of the antenna, as well as along the side may be causing issues. ![]() Also, PVC acts like a dielectric insulation, so we don't use PVC to hang antennas because it can change the frequency response of the antenna. ![]() Two issues I see right off the bat, those two antennas are too close to one another for a few reasons. How many watts of output are at the radio?ĭid you test the antenna before you put it on the roof?ĭepending on how long the cable is, you can get a false SWR reading at the radio. How long is the cable run and is it all one piece? What cable type and connectors are you using? Have you tried using the Comet?Īlso, as mentioned above, some more info can help us help you. The Comet antenna should be good to 470 MHz. ![]()
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