Thanks to all for the info. It's very helpful!

Missileman & jaka,

I do have both. After further investigation, the plastic "4" & "3" flags, flaps, whatever slide over the antenna and go all the way down to the base. The red cloth flag that says, "72 MHz AIRCRAFT USE ONLY" is specifically designed to clip to the top of the antenna. I think I get it now.

I'm going to try and get out to the field, time & weather permitting, this week to see if I can make contact with some of the local fliers.

Thanks again.