Having got the flight computer radio working with my homebrew antenna it was time for a couple of tests: test that the radio could actually transmit over a reasonably long distance and see how long the flight computer would keep running for. Here's GAGA-1 ready for its trip (I made a little cover for the antenna to protect it on the journey): The capsule will get lifted to over 30km and I'm using a 10mW radio transmitter. As others have shown this works fine with line-of-sight and a good antenna. To run the test I got a helping hand from my parents who dropped me off at one end of Abberton reservoir with my Yaesu FT-790R and a Yagi antenna while they drove off to Abberton church with GAGA-1 sitting on the backseat transmitting a short RTTY message. The total distance between the two points was almost exactly 5.5km. Got a few funny looks from birdwatchers and families as I stood there (although one person was kind enough to take my picture, see below). As they dr