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I think what Electron was trying to tell you is when you unplug the power from an amplified antenna, the preamp switches off, preventing signals from passing. That an unpowered indoor antenna behaved similarly to your unknown rooftop antenna leads me to believe that you still did not have a good connection between that antenna and your TV.
Most consumer TV antennas require a balun to match the coax cable downlead to the antenna. You did not mention how you connected to the antenna under test, so I have a couple of questions:
You are using coax cable throughout, not twin lead?
If you are using coax to the antenna, how did you connect to the antenna? If there is a balun involved, did you replace it, too?
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