Scanstrut seems to be the predominant player. Are there any more simple (less spendy) mounts out there? I’m looking something along the line of the stamped aluminum mount of the ufo tv antennas.
Look if you can a used one. We got a second hand one, stripped the paint off (luck had it that someone was sodablasting a boat in the same yard as us, so it was only a beer we paid for it.) and repainted it.
We made an aluminumwind gen mount years ago for the mizzen and it has held up well.
A radome mount should be fairly easy to make if you have shop access. We didn't use a laser to cut the alum. sheeting, but if you have it may as well use it.
Please post your final creation to inspire others to DIY.