I don't see why they wouldn't be. Basically all cities allow 3rd parties to run wires as long as they do all of the paperwork and rent the needed right of ways. Normally this is used for things like comm lines; but some inert wire isn't going to cause any issues.
The other religions would just need to care enough to ask, then install and maintain the wire.
I know of at least one religion that made it mandatory to run strands of wire around arbitrary areas. Brigham Young and his successors made the Deseret Telegraph a real community project.
This is a question about the first amendment. Is the government making rules in favor of one religion over, anyone else? Bob, an atheist, is allowed to run arbitrary wires around midtown manhattan, just the same as some other group?
