I have had my ArgTek installed for almost a month. Not great weather in Chicago so really haven't test all that much. Furthest distance was 3400 feet. About 400 better than stock. Tonight it was calm and warmer so I went out to an open field. Got to 250 ft in height and let her rip. At about 3200 ft I lost signal so I started to play with the 2.4 antennas. I turned them at a 45 degree angle away from center and signal came back full strength. Flew out to 4500 feet and got scared. I brought it home. I am pretty sure I could have went farther. Next I am going to try below horizontal center at 45 degrees with them pointing up a notch or two. 5k feet here we come.