Sounds like you have a CRT type of television. Depending on several factors it could just be antenna `ghosting' of the signal due to a reflection in the signal or cabling. It could also be your...
That's Highly impossible....... I doubt that you can even fit a flat screen T.V. on a porch, in less your rich! :] which your not rich! .....i am! rich... sucker! haha... sucks 2 be you!...i did say...
If it is reception, it will only appear on one channel. If it is on all channels it is the TV.
It also depends on area of problem. An LCD projector probably has a bad engine, but a CRT projector...
A large television screen will use more power than a small one although the difference isn't great. A television uses power to process the incoming signals and prepare them to be sent to the display...