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.
Back in the water in Grenada - with new main and #2 and cockpit canvas (Santa came early). Will spend the winter and early spring in the Caribbean and then head to Bermuda and the northeast US. Still trying to decide if we will bring the boat to Canada, either in 2015 or 2016.