Fiberglass hood

Just the man I hoped would chime in on the radio signal, 67Dart273, has done so.

Apparently, part of the problem is also interference from the ignition system and he related that Corvettes had special shielding around those components for that purpose. He also noted that signal strength is affected by the lack of steel under the antenna. His suggestion for a fiberglass hood was to paint the underside with aluminum paint with a ground wire to the steel body. I suppose the aluminum paint could then be painted with body color.