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On mast: longer range, you already have the 'post'.
On Mast: more involved/difficult wire runs
On mast: longer run to radar display (hopefully/ideally at the helm)
At stern: Shorter (but likely adequate) range
At stern: require a post of adequate height (overhead of cockpit crew) and stiffness
At stern: post mount reinforcement likely required
At stern: shorter wiring runs to helm, better access throughout (hopefully)
At stern: easier to clean dome
A gimballed mount would be preferred if you expect to need radar while sailing upwind, or spend a lot of time in a seaway with significant wave action.
Short mast sections - perhaps from a broken rig - have been used as posts with success.
I've got a self-leveling Questus backstay mount that was installed about 16 years ago. It's very similar to the Scanstrut mount. It places the radome about 10' above the waterline and has been more than adequate for range. It keeps the radome out of harm's way, as no sail touches it, whereas that would be an issue for a mast-mounted radome. There has never been a problem other than replacing the hardware store grade anti-chafe grommets where the wiring enters and leaves. The installation itself is simpler than that for a stern post, but the Questus was fairly expensive--somewhere around $900 back in 2001, if memory serves.
I own one of these fine vessels (hull #15). had this question a couple years ago. I opted to mount mine on the back of the boat, strictly because of ease of installation and maintenance accessibility. Works GREAT. I also thought... Me and my 31' boat are never going to be anywhere that I would need 26 mile radar contact.
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