I believe what you are looking @ is a “vertical antenna tubing kit” intended to be used for constructing an amateur radio vertical antenna, not for supporting other antennas.
I think something like one of these is more what you are looking for:
Because of shipping costs, try finding one locally.
I have mine attached to a tilt-over roof mount base that swivels and is held to the side of the house with aluminum wall brackets. I think the whole thing came from Radio Shack 30 - 40 years ago.