When I first acquired this system, I powered it up to see if it worked (it did). I listened to the signal on a communications receiver and remember thinking that it sounded very much like a galloping-ghost transmitter. I removed all of the batteries to prevent damage from leakage and it's been in storage for about 25 years. My intent was to install it and fly it... some day. I'm wondering if it would really be reliable or if I would be risking destroying &/or losing an airplane, engine and flight pack. I would be flying in a fairly remote rural setting, so I don't believe interference would be a big concern.