Leaky feeder

A leaky feeder communication system consists of a cable run along tunnels which emits and receives radio waves, functioning as an extended antenna.

The fact that this situation continued to exist after the 1987 King's Cross fire was criticised in the reports from the 7 July 2005 London bombings, where it hampered rescue efforts.

[7] In March 2020, two additional leaky feeder cables were brought online in the Jubilee line extension tunnels between Canning Town and Westminster.

Tyne and Wear Metro was the first railway in the UK to use leaky feeder cables for public mobile phone connectivity, in its city-centre underground tunnels.

A DAS system was deployed in some New York City Subway stations by Transit Wireless to provide Wi‑Fi and mobile phone and data coverage for customers.

The even field strengths produced by runs of leaky feeders spanning the entire fuselage improve coverage while requiring less transmitting power.

Leaky feeders are used in hotels, warehouses and other industrial buildings where it is difficult to get Wi‑Fi coverage using normal access points.