If you want to build a 30-foot (9.146-meter) antenna mast from locally available parts, please try this mast idea from Stephen Cline.
This project was submitted to Dave Casler (KE0OG) and was included in the popular "Ask Dave" webcast.
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=mqb8TtbyxXs
Here are some comments from Dave (KE0OG):
Thanks for joining us today.
Aloha es 73 de Russ (KH6JRM).