I have flown the IRIS since June. I checked many posts to find discussions with solutions, but haven't been successful yet.

My problem: the data link between the IRIS and my ground stations is lost too easily. Either using a tablet or a laptop, when the IRIS is about 70-80 m away from me I start getting the "Warning: no data for X seconds" messages. It makes me uneasy and the recorded logs are incomplete due to the lost connection. I also sometimes get beeping warnings from the RC transmitter, which makes me even more nervous.   

My flying environment: I only fly in open fields of corn and soybean for hobby photography. No trees or buildings on the way. I mostly do 6-minute autonomous missions at an altitude of 30-40 m. The IRIS has always completed the missions even with lost data link with the ground stations.

What I have done to correct the problem: I have checked the settings between the two radios, all items are the same (should ECC be checked?). I contacted 3DR, and they only suggested to check these settings. Antennas are always vertical, and properly tightened up.

My questions: Are there better antennas available? Can I get a better antenna for either the IRIS or the ground station? How worried should I be about this constant loss of telemetry connection?