I received this request from a VE ham.

"What gauge of insulated wire do I need to build a long wire for 20, 40, 80
meters.
In your personal experience, how long must the wires be to operate on said
freqs. I am using an old ts-820 only. I need to build it quick to listen in
on the upcoming Field day this June 23-24, 2007."

Thought I would ask here for opinions

Thanks
Lamont