Rowridge transmitting station

Columns: Frequency | UHF | kW | Service | System
471.25 MHz | 21 | 500 | Channel 4 | PAL System I | 489.833 MHz | 23- | 20 | BBC ( Mux 1 ) | DVB-T | 495.25 MHz | 24 | 500 | BBC Two | PAL System I | 513.833 MHz | 26- | 20 | Arqiva ( Mux C ) | DVB-T | 519.25 MHz | 27 | 500 | ITV1 | PAL System I | 530.000 MHz | 28 | 20 | Digital 3 & 4 ( Mux 2 ) | DVB-T | 546.000 MHz | 30 | 20 | SDN ( Mux A ) | DVB-T | 551.25 MHz | 31 | 500 | BBC One | PAL System I | 562.166 MHz | 32+ | 20 | BBC ( Mux B ) | DVB-T | 570.166 MHz | 33+ | 20 | Arqiva ( Mux D ) | DVB-T

Example questions:
What country did the PAL system , low UHF Rowridge transmitting station service extend into in 10 ' ? | How many places where signals emanate from are owned by the Rowridge transmitting station service with the highest UHF specifically stated to be positive ? | How many people work for the negative UHF Rowridge transmitting station service with headquarters in the most popular and well known English city ? | When was the Rowridge transmitting station service launched that is a UHF under 25 , and PAL System 1 , system ?

Answers:
Wales | 1,000 | 22,000 | 20 April 1964