Can anyone provide suggestions on fabricating an extension antenna for an aviation VHF handheld (in my case a Yaesu VXA-100)? I recall that we used to fab a "half-rhomboid" antenna from commo wire for our PRC-77 radios that significantly extended range over the whip antenna. I have in mind using the short whip in the air and deploying the extension on the ground if forced down over land. Thanks!