I think SWR is the least of one's problems after a crash....

In my ship the ground plane is a metal tab a bit smaller than a
matchbook and the antenna curls around the inside of the baggage
compartment. In either case, I'm just hoping things don't get torn up
too much and the thing works after a crash.

So, I'm not really worried about how well it works, as long as it stays
reasonably intact.

-Tom