Cecil Moore wrote:
4. I modeled the coil with EZNEC and got some segmentation
length warnings. EZNEC reported the 1/4WL self-resonant
frequency to be 7.96 MHz.

The above modeling was done using a traveling wave,
i.e. with the coil terminated in its Z0.

5. Using standing waves, i.e. no termniation, EZNEC
said the 1/4WL self-resonant frequency was 7.724 MHz.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com