Buck wrote:

Cecil Moore wrote:

Buck wrote:
Ok, I learned something, but I would be inclined to go with the 1/2
wave of 75 ohm and then the 50 ohm

"1/2 wave of 75 ohm" would make matters worse for a 25 ohm
antenna since the SWR would be higher than for 50 ohms.
What you need is 1/4WL of 35 ohm coax like RG83.

OOPS, I went back to the original problem with 100 ohm

Then you should use 1/4 wave of 75 ohm, not 1/2 wave.
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73, Cecil http://www.qsl.net/w5dxp