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What causes tv signals to freeze on my tv?

I have recently been having problems with the picture on my tv's freezing. This can happen at any time of the day and is becoming really annoying. I have not changed the aerial and the wiring is the same. There are two sets and both freeze at the same time. On freeview the picture freezes and if I switch to terestrial it rolls very badly? Does anyone have any suggestions?

Public Comments

1. Cabels may be loose, dont try it yourself, get an electritian :)
2. maybe get better cables or a good amplifier. Check this out there is a amplifier made by kitztech and many antenna experts have claimed it's one of the best because it has very low noise. Usually noise can cause the problems you mentioned. A crap amplifier can have a noise of 5db, usual good ones made by respectable companies like channel master or winegard have noise of 2-3db, this one has a noise of under 1db. check it out. http://www.kitztech.com/ this should eliminate pixelation and it has adjustable gain knobs so you can find which is perfect, it goes up to 20db, and I recommend you hook it up right when the antenna cable comes in the house.
3. Freeview is terrestrial. If you mean 'analogue' is rolling badly as well as Freeview freezing and pixellating then the problem is certainly caused by the signal from the aerial. The symptoms of weak reception on analogue television is picture break-up, rolling or background noise (snow or wavy lines). Digital television weak reception shows up as pixellated pictures, breaking up pictures, freezing pictures and/or complete loss of groups of channels. The symptoms can be random throughout any time but are sometimes worse in certain weather conditions. As you are seeing both types of symptoms on two televisions it is dead certain that you have an aerial problem. Check to see that the aerial is still mounted securely, isn't tilted and facing the proper direction. It may have shifted due to wind, broken mounting bracket or weight of perching birds. See if anyone has built something in its line of sight to the transmitter recently (a tall building, scaffolding or loft conversion somewhere down the road can cause problems). Examine the plug to see if hasn't come loose at the end of the cable. If you're confident, take it apart to see if the wires haven't developed an intermittent short circuit internally. Look at the cable and see if anything has damaged it or is trapping it (squashing it). If you are using an aerial amplifier see if it's batteries/power unit are still ok.
4. Picture freeze is generally caused two ways, (a) weak signal input to the tuner, and (b) transmission problems on the broadcast end. You can't do much about the latter; it's rather common. But anything you can do to increase your incoming signal strength, like a better aerial, will solve the first problem.
5. it depends on the weather
6. You have nothing to loose by adjusting your antenna a little bit. I only use free digital TV in the US - no cable just a cheap antenna! When I get a particular channel freeze up I just adjust the antenna. I get around 25 channels with an indoor antenna! Not all stations come in with the antenna in a single location.