I'm thinking about phased antenna arrays, and am wondering if it's possible to have three fixed position antennas, and vary the length of their individual feedlines to the common point through mechanical means.
The best way to describe what I'm thinking is making a section of coax out of two telescoping sets of tubes, one outside shielding, and one inside conducting. I'd probably shoot for something other than telescoping antennas, and I'd be using a cheap DC drill with either woven thread or an acme screw to move the inner parts relative to the outer parts.
I can leave one antenna connected to the common point via fixed length coax, and then connect the other two with these variable length coax devices in the feedline.
It seems like it's overly complicated, and that someone probably has come up with something better for switching a phased antenna array to point in any direction. Surely someone has already built one (or perhaps it exists commercially and I just haven't seen it yet) or people have considered it, but other solutions are better.
What are other options I should consider?