Update - i just removed all the stuff from the OTA and replaced it with a 25foot combined video/power cable.
I am sure you have the weather to thank for that. My scope is cleaner than ever after I have spent the past few nights cleaning any optic I can find.
Interestingly, using the extension cable made it so I get no signal from my easycap. I then tried the same easycap on another computer I get a signal fine but noticed that the easycap gets hot. I'm assuming there's some kind of signal amplifier inside the easycap and the extension cable requires more boost. I've had issues with the USB ports on the original computer before. So I guess I'm going to go back to the original setup!
My frame grabber (UVC) works fine with a 25ft cable. It is pretty cheap but works well and requires no driver install on win 8.1 or 7. You may want to give it a try. http://www.ebay.com/...P-/111679410951