Hi,
I'm hoping someone with radio/ham experience can steer me in the right direction to pick out the correct antenna mast. I've purchased a PCTEL GPS timing antenna kit, part number GPS-TMG-26N, for use with my GPSDO. The mounting kit includes a plastic base with a threaded female socket. It states that the antenna mast needs to be 1-1/4" diameter but it gives no information about the male threaded portion needed to secure the antenna base to the mast.
I have searched for the proper mast both in stores and online but have turned up little to nothing. Does this antenna mount want NTP pipe threads? Or should I be selecting some sort of PVC schedule 40 pipe? Or are there really zinc-plated steel antenna masts with threaded ends? Can someone please point me in the right direction to get a suitable mast. Stock picture to show the mount and thread:

If it helps, I'm planning on mounting the antenna against the roof soffet preferably on an 8' mast secured using Y-supports. The RG-6U feeder will run through the mast and out the bottom. I'll run it inside the house to the basement.