At the SSCA Gam in Annapolis last year they suggested a separate antenna as suggested here or a backstay one but with only insulator (at the top). I am replacing my standing rig in a few weeks and think I will go with the latter solution. The boat has the traditional rig with two insulators but these bits are quite expensive and if you don't need one of them ...
The rigger I am dealing with (Mack Sails in Florida) said he has never heard of an insulator failure.
Heading back to Lake Ontario for this summer. Now in Bermuda and heading to Long Island Sound in the first week in May. Then on to the Hudson and the Erie Canal.