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Does anyone know of a cheapish way to aim the antennae without using an expensive spectrum analyzer?


Unlike lasers, radio waves spread out with distance. So ultra-precision isn't strictly necessary here.

A handheld GPS receiver can be used to measure the exact locations of the two antennas, assuming you can get a reasonably clear view of the sky from the city apartment (rooftop directly above the antenna?).

Once you have the GPS positions, that same handheld GPSr can tell you the exact bearing between them, which gives the angle at which they must be aimed to "see" each other.

Or use a telescope... mmm.. that might be the easiest here.

For height to avoid earth curvature, one of the math types here should know. I think 30' should be sufficient, though.

Cheers