Garmin Stuff.

You trim the length until it comes into spec. Might be 1/8", might be 4/8"

A 48" antenna tuned might actually measure 47-5/8" While a 102" antenna tuned might measure 101-3/8"

Your statement about a length being how the tuning is set is correct, however I read it in response to my reply that the longer the antenna the better the reception was incorrect...

when in fact, both statements are correct. a tuned 102" will work better than a tuned 48"... Why do you think the garmin extended range antenna is longer than the factory antenna? The simple answer is the longer antenna works better.

Sounds like semantics to me.