If you wax the roof, please be careful... it's a lonnnnng ways from the roof to the ground if it's slippery!
Awhile back, I got mad at my batwing tv-antenna because I broke off the inside handle trying to turn it. So I got up on the roof with my trusty can of spray-silicone and liberally (an understatement!) doused all moving or semi-moving parts. It started raining and chased me off, so I went back up there later to apply more lube. The moisture had washed the silicone all over a good bit of the roof and it was the devil to even get near the antenna without looking like I was trying out for a skating medal.