A while back I thought I had a method for doing an outside antenna, but the HOA does not allow anything to be drilled, or nailed into the outside of the condo. But then I got to thinking a few plastic 3D printed C-Clamps could do the trick. << Something like this >> at Printables.com. All I would have to do is drill a hole in the turnscrew knob and I'd be in business. Printing in PETG would hold up to the weather and if printed in clear or a matching color they would never even notice. What do you think?
