Topband: base insulator source/suggestions?

[doktorij at bellsouth.net]

I've been pondering an upgraded Low Power transmitting antenna using an AB-621 mast. I'd like to insulate the base from ground. Not sure what would be best to use as insulators, or the safest separation to use. So far, I've looked at PVC pipe assembly and busbar insulators as options.

Does anyone have any experience with either of these or other ummm "junque" options?

Thanks,
Julius
n2wn