"Reg Edwards" wrote in message ...
Incoming radiation angles can be obtained by geometric calculation.
Pythagorus and all that, taking earth curvature, height of ionospheric
layers, number of hops, etc, etc, into account.


Then point your receiving beam into it, if it is adjustable in the vertical
plane. Very non-critical. Antenna apperture angles in the vertical plane
are extremely broad.


The stuff often comes in from more than one angle. Interference between the
different paths causes fading and distortion. An antenna will collect from
all vertical angles regardles of elevation.
----
Reg

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Interesting thing happened with the antenna last night.
Had the antenna in the vertical position close to ground ( it is a
truncated co linear dipole) And was prevented from joining the local
group because of multiple QSOs on the same frequency!

Art