DTR650 External Antenna - Any Luck at All?

I posted a very lengthy post on this on another forum. So far no hints at a fix.

Has anybody had any luck with using an external antenna on these radios? My range with a quality external antenna is reduced by 1/8 or more.

Just can’t figure this out for the life of me. Maybe somebody has a secret in their back pocket somewhere? :smiley:

What kind of coax are you using? Maybe the loss at 900MHz is too high?