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Can completely encase the balun , the balun , the twin lead , the coax connection , the coax.
Feed the coax up through the inside of mast pipe and out the top of the mast pipe , the coax will then be headed down toward the antenna , so this means that the twin lead end of the balun will be down.
For outside coax , always use coax that has the Compression type connectors on the ends of the coax , not the crimp type connectors.
Another type of wrap to use is ,
http://www.coaxseal.com.