The solid-state 60 kHz transmitter at Anthorn (in Cumbria) typically operates at around 27 kW of radio-frequency signal which is sent via a coaxial cable to the antenna tuning and matching unit. The T-shaped antenna is aproximately 180 m high and 300 m across the top. Because it is the vertical part that radiates, the signal strength at a given distance is substantially the same in all directions. In the case of a low-frequency antenna it is conventional to calculate what power would be required into a vertical 'monopole', whose length is short compared to a wavelength, over a perfectly-reflecting ground plane (EMRP - equivalent monopole radiated power) to give a known field-strength. This gives an EMRP of approximately 17 kW.