I have the SureLock. The cable that is now going into the TV should have the SureLock on its end and another cable on SureLock output into the TV. There is a small knob to turn on the SureLock. Read the instructions and turn down the adjustment knob at the top as per the instructions. Then start to turn the antenna. When four LEDs (or as many LEDs will light if in a weak area) you stop turning the direction of the antenna. Then you turn the adjustment knob up until the last light just goes out. Next you slightly adjust the antenna direction a fraction until that LED comes back on. You have now found the best direction for your antenna That should be the signal position to scan the TV at.
From what you have written just above, you are receiving only on the coax and it sounds like the antenna is not connected at all. With Coax alone it is possible to receive strong channels.
