Front end overload.

What is it?
Front end overload is where a receiver is not capable of ignoring strong signals which are outside of the frequency range it is designed to receive.
Although, for example, a TV should not pick up anything outside of the TV frequencies, a strong signal on any frequency may be able to overload the receiver and get through the system.

What can suffer front end overload?
This type of interference is associated with other receivers, such as radio and television. This is the most common cause of interference to televisions.

Tip. Interference to other equipment is the usual reason for a visit from enforcement agencies. Even if you are not to blame for interference, you would get busted for any illegal equipment found.

Who's fault is it?
As the equipment suffering the problem should be able to reject CB signals, it is the fault of that equipment - the radio, TV, etc.
However, there are things that can be done with the CB system to minimise the chances of this problem happening.

What causes it?
This can be caused by a combination of poor receiver design, poor tuning of the TV channels (not so common with modern type TVs), and too much CB signal getting to the receiver.

What should I do about it?
The key to curing this problem or, better still, minimising the chance of it happening in the first place, is to reduce the amount of CB signal getting to other receiving equipment such as TVs. Measures possible include:

Antenna position:
Wherever possible, your antenna should be mounted as high as possible, above television and radio antenna. Also, it must be remembered that TV antennas are directional - placing your CB antenna behind a TV antenna, rather than in front, may help to reduce the amount of signal getting to the TV.

Coax.
The use of old or cheap coax may cause more signal to be radiated by the coax, rather than the antenna. This signal may be picked up by your neighbours TV or radio, rather than other CBers. The position of your coax can also be important. It should not be placed next to TV or radio coax.

Antenna tuning:
Poor tuning of the antenna can cause the coax to radiate signal, which will be lower to the ground and closer to other equipment. It is in your favour to make sure that as much of your signal as possible is sent out at the antenna.

Do not leave your SWR meter in line:
As the SWR meter can cause losses and produce harmonics, it should only be connected while testing the antenna.

High Pass Filter:
If all else fails, a filter in the TV coax can cure the problem. The best type of filter to use, is the Braid Breaker type. These cost more than the basic filter, but are more effective.
This filter should be plugged directly into the socket on the back of the TV, not further down the coax. If the person has a video, the filter should go into the back of that, and the lead to the TV should be short as possible.