Do Not put plumbers tape on the connector threads. The best use on the outside of the connector is the self sealing live rubber tape. It seals to it's self and what it is applied to , it works so good that the only way to remove it is to cut it off. Here are some examples of amalgamating tape
http://www.surplussales.com/Antennas/Antennas-7.html . Electrical supply business sell the self sealing tapes. With it taped a weather boot is not needed. The coax the connector the matching transformer and the matching transformer wire leads that connect to the antenna can be incased with this tape. Always look inside the connector on the end of the coax to see if the shield and shield wires are pushed in toward the center conductor wire , if so push away from center conductor wire.