[HayZee518]

The RG-6 cable should be supported using plastic U shaped clamps. From what I've seen its a small saddle type clamp with two small nails, however in your case the nails would be impractible, so I'd suggest you find some #4 or #6 long sheet metal screws along with the smallest plastic anchors you can find. Drill a hole so the anchor will go in, use some silicone sealant around the screw and drive the screw along with the clamp into the anchor. you might have to drill a clearance hole slightly larger in the two hole plastic clamp to clear the screw.