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Bob and Beetle, read the following which preceeds the Summary notation and text that follows in Bob's post.

 

"Longwire and Windom antennas really aren't much different than verticals. They are a form of Marconi antennas, and require a counterpoise or ground of some sort. As with verticals, common mode current flowing into the antenna must be balanced by current flowing into a ground system. 

 

Instead of bringing the longwire directly to an antenna tuner, a better solution is using an RF ground system independent of the station safety ground, and keeping that ground isolated from the station safety ground."

 

Then read the summary below again and tell me if the article is suggesting that a grounded mast should be insulated from the radials or that a grounded mast should be independant (insulated) from common point ground for the station? Could it be that the word radial in the text below should not be there?

 

Summary 

The cure for common mode problems caused by less-than-perfect grounds is inserting a 1:1 choke balun in the system at the antenna feedpoint. The coax should also be kept away from the radials as it exits the area of the radials and the antenna. An antenna with a poor ground using few radials cannot have a support mast grounded to the radial common point (at least it shouldn't if designed properly). There is no exception to this!