This is exactly why I always change the antenna connector to BNC for any HT I own/buy, first. Operating the HT on the station antenna is a lot of fun, sometimes.
And I only buy BNC antennas for these HTs, too.
Personal opinion: I love the Diamond RHF-10 for being extremely short/convenient for local repeater operation. But I also love the Diamond RH-519 for having a much, much better reach and still being short and thin.
Comet usually offers mostly good knockoffs, btw.
@stefanfendt @dj3ei @alper yup, I learned to use BNC adapters from the good folks on here.