Master Antenna TV Systems (MATV) that is a communal aerial system traditionally designed making use of a configuration known as a ‘tree and branch’, and a variant named ‘a loop’.
The reason for having MATV installed is always to improve the signal that you are receiving for a television in a showroom for instance. This would be because you are connected to the local cable company. Signal is transmitted down the through the cables, some of which is leaked from the cables.