On 4 June 2014 03:38, Joe McCauley wrote: > That is the next step I think, how far apart do you put the antennas? I'm > guessing they can't be too far apart. > > They are close, approx 20 m. If you had a portable B that you could position the same distance from each and save trace to disk so you can move analyser to the other boat. I recall that the farming community I once belonged to were adamant that a two way radio (UHF) would fail to work if the antenna was mounted on the roof of a vehicle and the two way radio was mounted directly under the antenna inside the cab. justin --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .