Jon,
Interesting...……..verley, verley, interesting
A couple thoughts come to mind. First, EF Johnson engineers kinda knew what they were doing. We all know reading the manual isn't the manly thing to do, but give it a try. Walt, W2DU had a few words to say pertaining to the Matchboxes and past history seems to state they don't have a large matching range. Add the link coupling...……….hard to beat.
I'd connect the antenna through the Flashbox to a good antenna analyzer, tweak the knobs for a match, then note the return loss. What setup gives good numbers? Try it.
Murphy is always hiding somewhere: Just because it works in my backyard doesn't mean it will work in your backyard.
Craig,