In Conservation Areas and World Heritage Sites 1 such antenna is allowed on a dwelling, and 2 such antenna are allowed on a building or structure (other than a dwelling).
Mewn Ardaloedd Cadwraeth a Safleoedd Treftadaeth y Byd, caniateir 1 antena o'r fath ar annedd, a chaniateir 2 antena o'r fath ar adeilad neu strwythur (heblaw am annedd).