telescopic mast

Can anyone recommend a mast that would be suitable for a g5rv in a small backyard? I've looked at spider beam but I'm not sure if they are rigid enough. Right now I have a PVC on an old DirecTV mount on the side of the house so the agenda is only about 15-20ft in the air. Needles to say it...

i made this easy-to move mast, with tripod, hand erect, for light weight antennas.