In two years they have shown to be rather weak and difficult to repair. Actually the welding was
weakening the metal and making it very prone to break (The pictures in the previous pages refer to the first version).
For second (and
current) version I took a completely different approach, dipoles and half feed
line (5 quarter wave length) made of single 8mm aluminium tubing (so to avoid
the joints at the dipole) .
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