"karl" wrote in message
...
************In fact, the only thing I didn't like was that they installed
a
new Garmin
transponder antenna, without asking, because it was "recommended by
Garmin."
It was "only" an extra $150 -- cheap, in aviation -- but it still bugs me
that they threw away a perfectly functional antenna because it wasn't the
"spade" kind that Garmin recommends.****************

Jay, They did you a BIG favor. You should tip them for being pro-active on
the maintenance on your airplane. Everything on an airplane wears out, and
a
transponder antenna is right up there on the list.

Please explain how an antenna wears out.