Ian Jackson wrote:
I don't understand that, Cecil. Yes, the stub will be a halfwave on 40m,
and therefore add a low impedance in parallel with the antenna
feedpoint. Depending on the exact resonant length of the stub, the
impedance will be either a very low value resistor, a low value
inductor, or a large value capacitor. None of these is going to help to
convert the resistive part of the input impedance of the antenna to
something around 50 ohms.

You're right, Ian. I was trying to apply the same
principles that causes the stub to turn a full-wave
40m loop into a 1/2WL 75m dipole and had a senior
moment. But that idea would work with RG-174. With
a 3 dB loss in the stub, the impedance looking into
the stub would be around 50 ohms. :-)
--
73, Cecil http://www.w5dxp.com