179-weird TV interaction with LED/Fan

I'm kind of leaning toward some effect on the wiring, maybe in the ground.  I noticed one other time a marginal DTV pic could be changed by swinging the TV around on its mount.  That isn't right since it is fed with shielded coax. 
Of course with the outside antenna so close to the roof, and the roof being RF transparent  (not metal) it is hard to tell.
I even went outside and looked to see if maybe the fan was blowing moisture laden leaves away from the antenna....it wasn't.

Hah hah!   Unfortunately the company I worked for (27 years) has very restrictive policies and some very anal management and coworkers.   They act like the test equipment costs $100,000.
Oh wait- some of it did!

I may remove the bathroom LED light and shield the back of it.
The fan thing still has me puzzled though!

So we were camped for a week in a mountainous RF challenged area-  noticed that on one DTV station when we turned on the bathroom light the picture went to crap!   
Best guess is the LED package in the light is putting out RF interfering with the TV.  The LED is right under the antenna on our 179.

This gets even weirder-  we found that one other station that was a little pixelated improved to near perfect when we turned on the Fantastic fan in the bathroom.
We did this repeatedly in amazement.  Signal conditions were a little variable as a front had just moved through- Later the phenomenon disappeared.
That one really has me head scratching as the fan blades etc are plastic......so no reflection going on.

Unfortunately I retired as a wireless communications engineer a week ago and I no longer have access to a lot of fancy RF test equipment




Anyone else experience these quirks?