Diamond SRH320A Triband HT Antenna
I use this antenna on my Kenwood TH-D74 It is a SMA connection. I use a SMA to BNC adapter on the radio and a BNC to SMA adapter on the 320. With the two adapters back to back, it still appears normal. The Diamond BNC adapters are black, low profile and look great as well as preserve the small SMA connection.
My experience is limited but I've used it for APRS through the ISS. It works well as an upgrade to the stock antenna.
As I gain experience with the TH-D74, I'm sure that this will be the antenna that I will be using the most.