If it's a balanced antenna such as a dipole or Yagi, then the presence of a
good ground underneath the antenna can be a hindrance to low angle
radiation. Therefore putting it on a rocky hill will give you the advantage
of height, and can enhance the DX capabilities of the antenna.
If it is an antenna balanced against ground,( Vertical, random length wire,
or iverted L type), that needs a ground plane, then you will need to run out
a ground mat or, at the least, radials for it to work against rather than
relying on the ground conductivity. If the sides of your hill are steep
enough, running radials from a vertical down the sides of the hill will also
give you a lower radiation angle. It may also raise the feed point impedance
(for a 1/4 wave vertical) from about 36 Ohms over flat ground to closer to
50 Ohms!
Have Fun!!
72 de G8BOU/VE3CHH
or dip
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