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Myself and JohnE are the two big techies for the NYC area with wide coverage repeaters if you have any questions... Welcome to GMRS!

No, what is the total length of the feedline run from the inside of the repeater shed to the antenna? Under a 100FT length 7/8" heliax is overkill for your application. 1/2" LDF4-50A is more than adequate on UHF up to 90-100FT in length especially for what you want to do. There is no discernible performance difference between the commscope and RFS cables - it is just 2 rival manufacturers splitting hairs that are unmeasurable without expensive sweep gear. RfMedic

Since you are already "breaking the rules" by kerchunking the "repeater" you may as well give a brief voice transmission as well, such as "Testing, 1, 2, 3" and see if it is "parroted back" to your radio.