I asked Gary, K9AY, this very question. Here is his response to me on Oct 3,
2007:
"The loop's published size (25 feet high, +/-15 feet to the corners) is about
2/3 the maximum size for 160M. At one point, I was using one 30 feet high and
+/-20 feet to the corners, which worked well on 160, but had a lousy pattern on
80 -- this is with just a resistor for termination. You can use the larger loop
on 80 with a resistor-and-capacitor in series as the termination, but I have
done very little study of it."
So it would seem that the max size for a single band, 160 loop, would be
about 33 feet on a side. Going larger than that disorts the pattern and
degrades the cardiod pattern and F/B ratio.
73, Dennis W0JX/8
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