Use a conventional stainless steel
bracket or whatever that came with the unit. However, use Lanacote or TufGel to coat the screws that hold everything together and to the mast
- - Most corrosion
is between the aluminum mast and the stainless screws and or the base of the bracket. Wood is the least favorable thing to use as the wood rots and wears away with sun, wind
- - If you can find it, there is a tape made from teflon that can be placed on the bottom of the bracket surface that will be up against the mast. But in all cases, coat the screws with the above mentioned Lanacote or TefGel.