Chameleon Porta Mast extends to 25 feet, the plastic tube is meant to burried 28″ in a hole 12″ in diameter  and surrounded by concrete. If you’re handy you could attach it to a fence post or other structure. The instructions for it can still be downloaded from the Chameleon website.  I’m open to offers. My landed cost is $1050.00. The top of the tube  has a female a  3/8 X 24 hole.