dansawyeror wrote:
Simulation predicts the impedance will change when it is not feed at the
center, it appears to go up as the feed point is moved.

An off-center-fed dipole will match 300 ohm twin lead if
fed at the correct point. This is covered in my 1957
ARRL Handbook.
--
73, Cecil http://www.qsl.net/w5dxp