Splitters can be placed anywhere in or around the home. The most common places are in the attic, outside where the cable attaches to the house, or in a special low voltage distribution panel mounted in the wall (usually in a closet). A distribution panel might look something like this:
Sometimes, splitters are found inside the wall behind a cable wallplate (this is not a good place):
splitters like these should NEVER be used:
Splitter/Combiners like these are often used to insert signal from security cameras and tend to cause problems with the signal from the cable company. The lines for security cameras and for cable should ALWAYS be seperate. Satellite feeds should be on seperate lines aswell.
A splitter should NEVER be used in place of a barrel:
Any splitter or connection outdoors should use weather boots or rubber seals to protect against water intrusion/corrosion:
Terminaters like this are sometimes used on splitters or wallplates. If a terminater is used, then the wrong splitter is being used or the cable outlet should be deactivated (by changing splitters):