Hello, kllrbee
A preamp can go bad, but so can any of the connections between the antenna and the TV.
Your original TVFool report is no longer on the server, but if you have a channel that is strong enough, you can run a new known good coax directly from the antenna to a nearby TV (bypassing the preamp) to see if the antenna is OK.
If the antenna is OK, then reconnect the preamp and slide the combined/separate switch on the preamp back and forth, and then leave it in the combined position.
If the preamp still doesn't work, you will have to check the preamp. First measure the voltagre from the power inserter without the preamp connected:
If the voltage out of the power inserter is OK, then measure the voltage to the preamp at the upper end of the coax that connects to the preamp:
If that is OK, then measure the voltage to the preamp with the preamp connected; this is called voltage under load. This is a little more difficult because you need access to the center conductor when the preamp is connected. I use a T-adapter.
If the voltages check OK and the preamp doesn't work, try another preamp. Buy it from Walmart, Amazon is selling returns that haven't been checked out.