You're right about running a long ground, although here is a trick I've
seen work. If you have to run a long ground, over a quarter wave and it
can act like an antenna, do this. Use a piece of coax for your ground
wire, just the center conductor. At each end bypass the center conductor
to the shield with a .001 cap. That is the only connection to the shield,
just a cap on each end. It really does work and keeps the ground from
radiating.
73
Butch
WA0VJR
Node 3148
Wallace, ks.