Seamaster, I now have the 0.45m version and the 1m version which can be swapped in 30 sec.
The former is a soft 'rubber duck' type whip, like a bigger version of what you would find on a handheld radio, while the latter is made of a stiff steel/fibreglass mix (or something similar) and will snap. As I found out
Pacific Aerials Seamaster Pro VHF Helical Antenna - 1.0m - Only £23.95 - Force 4 Chandlery
I have a through deck mount on a plate on the A frame:
Pacific Seamaster Pro Through Deck Mount c/w 5m cable | allGadgets Marine
Be aware the 5m cable on this isn't long enough to reach the radio if your console is well forward like mine, I had to join mine under the helm seat.
I haven't tried to objectively compare the range but going on 'what I can hear where' there doesn't immediately seem to be a lot of difference from my limited observation so far.