To provide the groundplane against which your antenna works - the counterpoise. Copper foil about 3" wide provides a good groundplane when run below the waterline picking up anything grounded, such as keel, watertanks etc. It then connects to your antenna, ATU and radio ground connections. Flat conductors such as copper foil provide a counterpoise whereas round wires don't. I had this system, recommended by the radio guru Gordon West, and it worked very well.
-------------------- John
http://www.saltyjohn.co.uk
Uncommon cruising kit: Metz, Loos, Bandit, Clipper...
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