Just found this old thread. I had to remove my antenna last year because it broke. My radio is old as well. I dont go offshore, am i okay with just a hand held? They do make them pretty well these days
the issue with handhelds on boats is they have less power plus you are moving up and down rapidly with a very short antenna trying to maintain line of site. that's fine in calm weather but you can intermittently lose signal in bad weather when you need them.
that being said, i just switched to a 4 foot shakespeare antenna for my grady because i keep breaking the 8 footers. my understanding is the 4' will perform about as well as the 8' in the inshore waters i use in british columbia (supposedly it actually performs better at some things), but an 8' is better to go offshore in rollers to maintain a constant signal. i am no radio expert though and note also that up here the coast guard has repeaters on mountain tops which give them good line of site range. if you are in florida your mileage may vary.
i also just bought a shorty pacific aerial rubber coated whip antenna for a little 14' runabout and used circa 2002 icom fixed mount vhf (no dsc). this whip was very cheap and fits in a normal antenna mount. $25 iirc. i deliberately went that way for this boat instead of a handheld, because my experience with vhf on land is that any base station even with a short whip will crush a handheld vhf on performance. the whole setup actually ended up cheaper than a decent handheld.