Hi Peter,

next mail to same guy...
I didn't design this beauty, but I was the guy doing the transmitting range
tests. But as I am a ham op, I would use a 70 cm transceiver for the
testing of transmitter efficiency. Also, I would adapt the LC matching
network for max electromagnetic field between transmitter output and coil
"antenna". A TV test receiver will give good results also...
Of course, the efficiency is almost proportional to the cross-section of
the loop, but in the application I had size was essential, not absolute
efficiency. So while designing, define your requirements of space, range
and transmitting power, and then cook a workable solution out of this.

Greetings

Jochen DH6FAZ