I have been designing a 10MHz quad loop. It is roughly rectangular and
the bottom wire is about 3m above the ground. EZNEC shows the feed
impedance to be about 130 Ohms (verical side). Now going to reality -
I have put it up and, at the end of a quarterwave transformer (75 ohm)
I measure 93 Ohms at resonance. Back calculating gives me a feed
impedance of 60 Ohms - half what I was expecting. Any ideas?