You might like to look at extendable poles, There are two or three kind that work fairly well depending on the weight and air profile of the antenna.
Painter's poles, tend to be fiberglass or wood, but I've seen them 20-30-more feet long (2.5 story house with attic, painting the very peak standing on the ground) I'm not sure they would hold the antenna plus no "Ground" via the pole (you could run a ground strap)
Flag Poles, Mine is a 20 footer as I recall, Sunsetter, Aluminum Plus I can run a ground strap. I believe this will hold your antenna.
Fiberglass flag poles.. Too much flex to make me happy.
NOTE that these come with a variety of mounts. including one (or 2) that woudl bolt quite nicely to the "A" frame, in fact the park-on base I have (I park 26,000 pounds of Class A on it) could be very very slightly modified to bolt to the "A" frame.
The mod.. Basically drill some holes (for the mounting bolts) and trim one end a bit .
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