Before I started hanging the drywall in that room, I did share some of the work I did to run coax, rotor cable, conduit, etc. across the rec room. I discussed that way back here, but if you recall, I basically ran a bunch of wire, coax, and conduit, and left the ends in a box against the outside wall. The idea was to make it easy to do the penetration to the exterior when the time came. Here's a couple pics as a reminder of that:
Now, with drywall in place, the same spot looks like this:
This gives me an easy access panel in the basement, so that when I get to the tower part of the project, I'll be able to put a matching box outside the house, drill through the exterior wall into the back of this box, pull my cable and wires through, and make my connections in the outside box, where all the connections to tower, ground, etc. will be.
Just trying to plan ahead as I keep plugging along with this project!