While antennas don't "pull in a signal" they capture what is in the air. With DTV today the signals are limited to basically line of sight from the transmitter to the receiver. Some antennas capture more signal and are in effect physically larger in order to do so. Adding a booster amplifier will help make for a bit stronger signal at the TV set, but if there is no signal captured, there is nothing to amplify.
Foliage on trees and RV walls and structures will attenuate a TV signal. The better option is an outside antenna, erected and pointed toward the TV station transmitter. There are maps showing TV transmitter locations. Case and point, there are no TV transmitters in Nashville. They are all located a few miles outside of Nashville in various directions and distances.
As an RF Engineer and ham radio operator, one motto: "If it stayed up and survived the last storm, the antenna wasn't big enough nor high enough".
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