What would be a middle of the road antennal upgrade for the 915 mhz 3D robotics telemetry? I ordered a 21 cm [ larger ] pole antenna for the plane. If I got this http://www.ebay.com/itm/Ramsey-LPY9-Logi-Log-Periodic-PCB-Antenna-915-MHz-/360283780191?pt=US_Networking_Boosters_Extenders_Antennas&hash=item53e296345f for the ground end would it loose all signal if I flew behind it even if I was still within 1000 feet? I primarily always want to fly long range the same direction, so I could aim it that direction, but I just don't understand just how directional these antennas are. Does 30-40 degrees mean all is lost out of that range even within site say 1000 feet? Thanks
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