Unless you want the connection to last for 20 years, use a simple clamp.

As for me, like many others, I've never kept an antenna for longer than 6
months.

=========================

"Dave" wrote
The answer must be here but after some searching I can't find it.
There is all sorts of conversation about ground rods and dissimilar
metals but I can't find the basic answer I need -- How do you make the
steel to copper connection? Do you simply clamp galvanized steel to
copper? Thanks.