Old as Dirt!
Join Date: Nov 2008
Location: Tampa Bay Area
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Aside from the fact that the weight of the radome is not something you want to introduce to a spreader, particularly when it's to leeward, the loss of signal to the mast will not be insubstantial. The same is true to some extent of a radome mounted forward of the mast but, as the side-to-side dimension of the mast is usually a lot less then the fore'n aft dimension, the effect is lessened; and, a target approaching from astern is somewhat less of a hazard than a missed target approaching from one's [blind] side. To give yourself an idea of the cone of blindness, cut a disc out of cardboard the same dimension as your radome and position it on deck, beneath the spreader, as far outboard of the mast as it would be if it were actually mounted on the spreader Then draw straight lines between the center of the disc and the fore and aft edges of the mast. The resulting cone, radiated outward from the mast to port or starboard, will be your effective cone of blindness.
With a proper mast mount, your mast-mount and sail will have little interaction.
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."