Why doesn't my HD antenna work anymore?

I installed an HD antenna and dumped cable. It's an upper end indoor antenna with a plug in signal booster. I'm 30 miles from the tower but I'm getting channels in from Indiana as well. I had dozens of channels, birds were singing, life was good.

I then received a sizable bandwidth booth from Comcast for ten bucks. It came with free basic cable. Sure, why not.

I installed basic cable and the HD antenna stopped working - no digital or analog signals. Coincidence? I'm just on the edge of the reception area for a strong signal so perhaps the winter weather caused signal degradation. I waited for a sunny day. Same problem.

I exchanged the antenna for a new one. No luck. I thought the problem may have been the HD converter in the TV but I'm also not receiving analog signals.

If anyone has any ideas, please do let me know.

EDIT: It's not the physical coax inputs nor is it the coax itself. Both inputs work fine with cable. The coax was switched with the new antenna.
Asked Mar 14, 2013

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