The best way
[I believe] is with a single, continuous copper ground wire
[14-to-10 gauge] from the base of the antenna to a copper ground rod at the base, driven 4-to-8 feet into the earth.
You could just ground the mast at the base, but your antenna/antenna system would be seeking ground through any number of joints in the masting, if there is any electrical connection between them. Better to run a ground from antenna to earth, as above.
Make sure that you have tight, clean connections. Weatherproofing connections
[antenna and ground] with some sort of sealant is a good idea. A static/lightning arrestor in the feedline would be wise as well.
Good luck!