Nope, haven't actually seen it, so it's just hearsay I guess. I do know that the rear window tint on my Soarer was done in non-metallic because the antenna setup is the same as the IS. I never heard a before/after so I have no idea to the validity of the claims.
Yep, I had a think about it, and realise that the tint is "under" the antenna so shouldn't affect it, and yes it's insulated with a plastic layer. :shrug: