Yesterday, I had unhooked all my antennas several times during the day.  At one point, things kinda settled down a bit and I hooked up my 6m beam after seeing plots showing several stations on in the middle part of the country.  

Not seeing any local activity, I went to 10m -- nothing, and several other bands that should have been pretty active where I heard a couple of very weak stations.  By that time another front moved through, so I went to the shack and disconnected the 6m antenna and moved to my antenna switch box to unhook those 6 antennas and realized that I had not even turn on the antenna switch or connected the antennas.  No wonder the bands were "dead".  So, what I was hearing was on a 10' of LMR400 cable dangling in the air from my radio to the vicinity of the switch.