There have been articles in QST about using telephone poles (non conductive) and the repeater I sort of founded (Even if they do not give me credit) originally had the receiver site on such a pole.
If you have an antenna mounted on the roof of your house, as most every house did for several years back before Cable TV and many still do today.. It is on an insulated ROOF (As is my own TV antenna)
There is no problem with a non-conducting mast..
Now, here is another consideration....
A conducting mast of the proper length is..... an antenna. and if that antenna happens to be resonate on the 2nd or 3rd HARMONIC of your transmit frequency... I can see big problems.
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