I used a couple of pieces of 5-foot antenna metal mast lenghts - The PVC is two different sizes where I can rotate the inside one. The top outside PVC one is attached to the side of the trailer using the thumb screws. Reaching thru the window flap I can turn the inside metal mast sections.
The bottom metal pole with a piece of round PVC for a stop just sits down inside a TV antenna mount attached to the frame...
The top bracket is from a HIDE-AWAY Antenna mount and this just holds the outside PVC tubes stationary. Inside tube is what rotates... You may have to fabric the side mount bracket. It came with my WINEGARD HA-0130 HIDE-AWAY rotating DIPOLE worthless antenna... Maybe you can connect them and purchase the bracket only.
The two metal pipes are smaller and fits inside the stationary PVC larger pipe. The whole length of the smaller metal pipes that the BATWING antenna is attached too does the rotating...
The RG 6 cable goes in at the top of the metal tubes and comes out on the bottom to go inside the trailer to hookup to the HDTV. I use one of the in-line 12VDC power source to provide 12VDC to the BATWING antenna amplifier.
I know its all clear as mud right... Just go to LOWES and look at the 5-foot antenna mast sections and PVC tube components. You will come up with something...
It all breaks down to 5-foot lengths and rides inside the POPUP when in transport.
Roy Ken