Remember TV antennas from the pre-cable days? Rear Window needs one on the top of Miss Torso’s apartment.

They were quite varied, I found out, as I was looking for a good image of one:

 

So I made one from some plastic piping that I found at a train show. It is not the right scale for pipes in a 1/12th scale scene but it was perfect for the pole and arms of the antenna.