[tfw]
[/tfw] For some reason everyone seems to make verticals with the largest tube on the bottom of their verticals.. Well I make the bottom tube by cutting the second largest dia tube and using a couple of feet (400mm) on the bottom and it is easy to adjust to length for the required frequency.. no need to drop the vertical..
When making slots in tubing put two hacksaw blades in ur saw so it will makes a better slot