were carried out at Zaandam, Netherlands. Between 31 January and 1 May, Radio Caroline South broadcast from the vessel Cheeta II, owned by Britt Wadner of Swedish offshore station Radio Syd, which was off the air because of pack ice in the Baltic Sea. The Cheeta II was equipped for FM broadcasting, so it was fitted with the 10 kW transmitter from the Mi Amigo, feeding a makeshift antenna. The resulting signal was low-powered, but ensured that Caroline South's advertising revenue would continue. The Mi Amigo returned to its Frinton-on-Sea anchorage with a redesigned antenna and a new 50 kW transmitter and attempted to resume broadcasting on 18 April, nominally on 259 metres to enable the same jingles as Radio Caroline North on 1169 kHz to be used, but actually 252 metres. The transmitter was initially too powerful for the antenna insulators. On 27 April, the Mi Amigo was fully operational. Radio Caroline South's 259 metres signal was now near those of Radio London on 266 m (1133 kHz) and the BBC's Light Programme on 247 m (1214 kHz). Radio Caroline North subsequently moved to 257 m (1169 kHz) but also called it 259. Radio City affair In October 1965, negotiations began for Radio Caroline to take over Radio City, which broadcast from Shivering Sands Army Fort, a Second World War marine fort off the Kent coast. One of Radio Caroline's directors, Major Oliver Smedley, formerly of Radio Atlanta, entered a partnership with Radio City's owner, pop group manager Reginald Calvert and installed a more powerful transmitter on the fort. However, according to Gerry Bishop's book Offshore Radio this transmitter was antiquated and failed to work. Smedley later withdrew from the deal. On 20 June 1966, Smedley boarded the Shivering Sands Fort with 10 workmen to repossess a transmitter that he had supplied, but had not been paid for. The next day, Calvert visited Smedley's home in Saffron Walden, Essex, to demand the departure of the raiders and the return of vital transmitter parts. During a violent struggle, Calvert was shot dead. Smedley's men occupied the fort until 22 June. Smedley was charged with Calvert's murder on 18 July, but this was reduced to a charge of manslaughter. Smedley's trial opened on 11 October at Chelmsford Assizes, where the jury acquitted him. Legislation In 1967, the UK Government enacted the Marine, &c., Broadcasting (Offences) Act 1967, outlawing advertising on or