[Amps] crossmodulation in PA ? Thanks for all good  advice

[k7fm]

There was mention that copper bonding straps were connected on the tower 
legs.  If the tower legs are galvanized steel, that would be a good source 
of oxide and a natural rectifier unless an anti oxidizing material is used 
to prevent such.  Some of the early rectifiers were copper oxide.

The corrosion could also cause the tower to fall down.

73,  Colin  K7FM