Since I placed my antennas last year, I just put the coax cables thrue the roofwindow. A pretty fast solution but far from ideal, especially in wintertime since I can’t really close one window. Some time ago I bought an rooftile of lead. I think it is originally destined for some kind of mast. But if you mount it up-side-down it could be a great way to put coax cables thrue inside.
So I removed one rooftile and gently drilled a hole in it. Mounted the lead on top of it and put the tile on the roof again. Putted the cables thrue and sailed the whole thing with vulcanization tape. It looks pretty solid, let’s hope that is survives the winter!