full wave

I am looking take a 102" whip and cut it down to 72.9" for use as a full wave receive only antenna at 162Mhz. The antenna will be placed on a tower at 320' AGL. If the antenna is RX only does it require a ground plane? I know the antenna will no longer be 50ohms will impedance miss match...

I'm a communications guy in the Army and i was hoping some of you experienced radio guys can help me. I've googled my question and found some similar questions here on this site but i'm trying to get a little more specific answer. I have a really good old manual i found on making field...