As I understand it,a colinear antenna, is a series of half wave
elements, that are phase reversed (if that make sense) from one to the
next.

Could you build a colinear of a single long line, bending it outa nd
back, at 90deg, every half wave, with the bit sticking out (and back)
being a half wave total out and back? would that result in the same
effect as a colinear?

something like this.

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Jim Richardson http://www.eskimo.com/~warlock
Televangelists: The Pro Wrestlers of Religion