The TV antenna is wired into the booster and then out to set two. The outside connection is probably for cable TV connection, which is ALSO wired into your antenna booster connection, and then on to set two.
Turn booster on for a better antenna connection, turn it off for cable TV connection.
There is an off chance the outside connection is for satellite, but doubtful.
Now, this is predicated on the fact that I'm assuming the connection is on the off door side.
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