Note: Channel A was never used terrestrially. The only System I Band I transmitter on Channel B was RTÉ One from the Maghera, Co. Clare transmitter during 1963–1999. Channel A was initially intended for use at Maghera but Channel B was used instead because of the risk of interference to (overspill) reception of BBC 405 line transmissions [http://www.oireachtas-debates.gov.ie/plweb-cgi/fastweb?state_id=1242939967&view=oho-view&docrank=109&numhitsfound=594&query=Channel%20A&query_rule=%28%28$query1%29%3C%3DDATE%3C%3D%28$query2%29%29%20AND%20%28%28$query4%29%29%3ASPEAKER%20AND%20%28%28$query5%29%29%3Aheading%20AND%20%28%28$query6%29%29%3ACATEGORY%20AND%20%28%28$query3%29%29%3Ahouse%20AND%20%28%28$query7%29%29%3Avolume%20AND%20%28%28$query8%29%29%3Acolnumber%20AND%20%28%28$query%29%29&query1=19520101&query2=19631231&docid=113252&docdb=Debates&dbname=Debates&numresults=100&starthit=100&sorting=none&operator=and&TemplateName=predoc.tmpl&setCookie=1|#]. It was moved to Channel E due to interference from distant transmitters on channel 3 and channel itA via certain atmospheric conditions and other reasons. Channel C was used by a relay transmitter in Glanmire, Co. Cork.