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Took a couple weeks for our schedules to align, but we were able to test swapping radios today. Tested a bunch of different configurations to see what worked the best and here are the (hopefully readable) results. TLDR: Confirmed stock antennas are terrible, NA-771R is a huge improvement. UV-5R doesn't work well on Narrowband. High/Low power doesn't make much of a difference. All tests were performed with the below radios at these locations:Point A - GMRS-V1 - High power (5W) / Low power (2W)Point B - UV-5R - High power (4W) / Low power (1W) To keep things simple we started with "symmetric" tests, same equipment and settings on both radios: NA-771R Antenna Tests Test 1 - We could both hear each other normally GMRS-V1 NA-771R High power Wideband UV-5R NA-771R High power WidebandTest 2 - We could both hear each other, but there was more static GMRS-V1 NA-771R Low power Wideband UV-5R NA-771R Low power WidebandTest 3 - UV-5R could hear GMRS-V1 with a little static, GMRS-V1 could not hear UV-5R at all GMRS-V1 NA-771R Low power Narrowband UV-5R NA-771R Low power NarrowbandTest 4 - UV-5R could hear GMRS-V1 normally, GMRS-V1 could not hear UV-5R at all GMRS-V1 NA-771R High power Narrowband UV-5R NA-771R High power Narrowband Stock Antenna TestsTest 5 - UV-5R could hear GMRS-V1 with a lot of static, GMRS-V1 caught a few bursts of static but nothing recognizable GMRS-V1 Stock High power Wideband UV-5R Stock High power WidebandTest 6 - UV-5R could hear GMRS-V1 with a lot of static, GMRS-V1 could not hear UV-5R at all GMRS-V1 Stock Low power Wideband UV-5R Stock Low power WidebandTest 7 - Neither of us could hear each other at all GMRS-V1 Stock Low power Narrowband UV-5R Stock Low power NarrowbandTest 8 - UV-5R could hear GMRS-V1 with a lot of static, GMRS-V1 could not hear UV-5R at all GMRS-V1 Stock High power Narrowband UV-5R Stock High power Narrowband Based on those tests it seemed like High power Wideband was giving us the best results on both antennas, so we only tested swapping antennas with those settings: Mixed Antenna Tests Test 9 - We could both hear each other, but there was a lot of static GMRS-V1 Stock High power Wideband UV-5R NA-771R High power WidebandTest 10 - UV-5R could hear GMRS-V1 with a lot of static, GMRS-V1 could not hear UV-5R at all GMRS-V1 NA-771R High power Wideband UV-5R Stock High power Wideband If you made it this far, what are your thoughts? Clearly the NA-771R at any power is the winner here, but why were the results so poor on Narrowband?

DeoVindice: I am transmitting outside, set high power and I am using the antenna that came with the radio. I'm going to try the CSQ. let you know. If you can think in anything else?...Thanks

This is a store-forward unit.