No only 11.1 is blocked .if I disconnect all the lan cables to the cameras it's clear, if I unplug the NVR the channel instantly comes back on.
I precprevio thought it was one camera lan cable or that camera but after disconnecting it yesterday channel 11.1 did not appear until I started disconnecting other lan cables, almost like it was going to the path of least resistance.
As stated, the cables are acting like antennas. However I'm curious how close the cables are to the coax for your antenna and the power supply / antenna amp.
How is your tv reception with the antenna amp unplugged? Be aware amps amplify the noise too.
Do the power supply for the amplified antenna and nvr share a power strip?
The simplest and most time efficient thing you could do would be post some pictures of various things we've been talking about in the thread (cabling, cords, inside the nvr, etc.). There could be something that jumps out to someone else as a possible issue that you didn't think about. The NVR / cabling are clearly causing the problem, but there could be other aspects of your overall set up that are increasing the effects of a small amount of noise.
You mentioned your antenna is a flat syle antenna from monoprice. Often these antennas don't have great VHF (11 is VHF) performance and they often use some pretty low quality super tiny coax cable. If you had a better antenna (that doesn't even need an amp) this was connected with RG-6QS you might not even have a noticeable problem.