K8JHR asked "Could someone please identify which section of my
ARRL Antenna book covers this "Delta Loop" - as that term does
not appear in the Index."
The ARRL Antenna Book does NOT discuss delta loops. There is, however, a
good discussion in ON4UN's Low Band DXing book.
These are effective DX antennas when fed 1/4 wavelength from the top. I had
one on 80 some years ago, and it worked well for me.
There are some caveats: The layout will affect the antenna's radiation
pattern. The delta has a limited SWR bandwidth, although a GOOD tuner will
overcome that problem.
The delta is hard to beat for DX, especially when one considers its
relatively low cost. :-)
73, Bill, N5TU
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