My ground system consists of four 4' earth spikes which are each
connected to the 3' copper tank that is buried 4' in the ground. I
also use a 120' length of wire connected to one of the earth spikes &
running underneath the top loading wire. This wire runs 60 foot down
the garden, before coming back on itself & still staying underneath the
top loading wire.
I also have a wire
from one of the ground spikes croc clipped onto the bottom strengthning
wire on my garden fence. This wire runs a few hundred feet along the
fence that seperates my garden & others from a field. If I had more
room to run radials I guess that might help. However I don't have room
for any more & I'm happy with the fact that installing the copper tank
dropped my background noise level from S9 to S7. It also improved the
TX.

Regards,
Phil. m0vey