amdx wrote:
I don't get that number at all.

Yep, Dave was off by a couple of magnitudes.
6 inches is 1/8WL at 246 MHz.

Anybody have a url of a page that shows receive pattern of two antennas at
different spacings, 1/8, 1/4, 3/8, 1/2 wavelengths?

My 1980's ARRL Antenna Book has those patterns
using different phasings and different spacings.
--
73, Cecil http://www.w5dxp.com