I currently recieve all of my local OTA digital channels except one through my antenna. The only way I can recieve that channel is through a spilting my antenna signial to my tv and stb. Problem being that this channel is analog through the tv. Question being the picture on FOX (analog) has vertical dots on the screen that move all over the screen. Is this from the antenna itself or maybe from inside electronic interference. What can be done to reduce or get rid of this?