| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | RO | Overflying restriction | | | XX | miscellaneous plain language | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | N | For immediate attention of aircraft operators | | | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | W | Navigational Warning | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 011 | 1100 feet QNE | | | / | | | Centre Latitude | 5114N | 51° 14' North' | | Centre Longitude | 00207W | 2° 7' West | | Radius of area affected | 001 | 1 nautical miles |
| | E BAND HIGH INTENSITY RADIO TRANSMISSION AREA ( HIRTA ) IN LOW FLYING AREA 1A AND NIGHT ROTARY REGION 1 AT POSITION 511352N 0020718W,( BISHOPSTROW,WILTSHIRE ) RADIUS 0.5NM.MAXIMUM HEIGHT 344FT ABOVE GROUND LEVEL.24 / 11 / 068 / LFC SAFE DISTANCES CIVILIAN AIRCRAFT 0.0836NM 189FT ABOVE GROUND LEVEL MILITARY AIRCRAFT SUSCEPTIBILITY VERY LOW 0.0595NM 42FT ABOVE GROUND LEVEL LOW 0.0715NM 115FT ABOVE GROUND LEVEL MEDIUM 0.0817NM 176FT ABOVE GROUND LEVEL HIGH 0.1093NM 344FT ABOVE GROUND LEVEL PULSE LOW 0.0584NM 35FT ABOVE GROUND LEVEL PULSE MEDIUM 0.0629NM 62FT ABOVE GROUND LEVEL PULSE HIGH 0.0718NM 116FT ABOVE GROUND LEVEL |
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