FW: [FoxHunt] Turnstile antennas for 2M

[WolfBob]

Always one to admit when I am wrong, or misled..I am wrong. The ARDF 
decision to use horizontal polarization made long ago in places far away 
was the right decision even though it precluded optimum operation of 
TDOA type direction finding hardware.

I investigated the difference between a multi element antenna operating 
with the elements vertical and with the elements horizontal and located 
a few feet off of the ground, a typical location for ARDF hunter 
antennas. The ability to measure bearings is grossly different and 
significantly better with the elements horizontal.

A typical antenna, 55 inches over a real ground, with the elements 
horizontal has a lobe at 20 degrees elevation and 11 dBi gain and a 3 dB 
azimuth lobe width of 68 degrees. The same antenna at the same boom 
height with the elements vertical has a lobe at 12 degrees elevation 
that has 6 dBi gain and an azimuth lobe width of 125 degrees. A 
significant difference.

Bob, WB6JPI