I was saying your rig is large, not that you are
You've only proved the TV is good.
There are several possible culprits.
The antenna with its cable with crimped on ends; the amp (which needs 12 volts) and must be turned "on", with its cable and crimped ends; possibly a splitter with more connections and cables. You proved the TV isn't getting over the air signal with enough strength but not that the antenna itself is the culprit. If the amp is so hard to get to, how are you expected to be able to turn it on for over the air and off for campground (or satellite) cable service??