I replaced all the coax cables and connectors, but the old antenna stayed. May or may not be the culprit, but the radio is a vintage Uniden (c. 1980). Probably time for a new one, but she was a good one while she worked!
An antenna replacement could be in order, but at this stage in the game would require a trip up the mast (Drat!)
Looking into some hand helds as I write this...
Thanks again for the suggestions and information