Yes, and mine is in the attic as well, well within the cone of protection afforded by the (properly grounded) mast my anemometer is mounted on. I would entertain thoughts of how to safely mount it higher. For anything in the past, it was usually a simple matter of something like a spark gap arrestor on the lead-in. I've no idea how to obtain the same protection with an active antenna like the Boltek uses...
Thoughts:
1. http://www.lightningsafety.com/nlsi_pls/cone-of-protection-myth.html and
http://www.wrh.noaa.gov/hnx/LightningMyths-1.pdf2. Regardless, I suspect that if lightning does strike the properly-grounded mast, I suspect there would be substantial induced currents in any conductor within perhaps 100 ft. or more. [That is based on one incident of direct experience, where lightning struck a well-grounded metal tower
near my house, and took out several electrical things within the house]
3. If my "induced current" suspicion is incorrect, then consider: lightning is much more likely to directly strike a well-grounded mast, than to strike something that is insulated (PVC pipe or whatever) mounted above the mast. So, the "cone of protection" extends above the mast?
4. Lightning striking any particular place is low-probability, and if it does strike, the effects are essentially unpredictable. Therefore, I do what's reasonable (properly ground my tower), and accept that there will be some (unpredictable) damage in that low-probability event.
Oh, for the record, my Boltek antenna is mounted in a PVC "bubble" on top of a 10-ft PVC pipe that extends about 8 feet above my well-grounded tower (bottom part of a Hy-Gain 18HT).