Thanks a lot for your advice. I would like to use the loop on 80 meters
also, but I thought that the self-resonant frequency of a 100 feet perimeter
loop would be too low for the loop to be resonated on 80 meters with a
series capacitor.

Also, from reading some material in the ARRL 20th edition Antenna Book, I
noticed that Ted Hart, W5QJR, used a gamma-matching arrangement to feed his
loop. If a small interior loop is used to feed the main loop, are capacitors
needed to couple the coax feed line to the small loop? Hopefully, these
capacitors would not need to be changed after the initial setup procedures
have taken place.

"Reg Edwards" wrote in message
...
[additional text]
The best method of feeding is via a small loop of wire inside the main
loop in the same plane. The small loop is approx 1/5th of the diameter
of the main loop and is insulated from the main loop. The small
coupling loop is just a self-supporting wire between the inner and
outer conductors of a 50-ohm coaxial feedline and can be located at
the bottom of the main loop.
[additional text]
With a perimeter of 100 feet, on 160 meters performance will be about
1 S-unit worse than a 1/2-wave dipole. On 80 meters performance will
be about the same as a full-size 1/2-wave dipole at the same height.
The perimeter is too long to work on 40m.