Cellular telephony is a radio-based technology and is only made possible by the erection of transmitting and receiving antennae at locations which enable radio signals to be accessed. Where possible the antennae can be mounted on a tall building. More often, a suitable existing structure is not available and a purpose built mast must be erected. I fully understand the conflict that this engenders in certain areas between inclusion of the area within mobile telephone coverage and preservation of a mastfree environment. There are unfortunately no technological solutions which avoid this conflict most particularly where there are no existing suitable structures. It is, however, a matter for the planning authorities to seek to find the appropriate balance and there is, of course, a general right of appeal to An Bord Pleanála. However, my Department did assist the Department of the Environment in preparing the guidelines for planning authorities on telecommunications antennae and support structures which were published last year by my colleague the Minister for the Environment. These guidelines go a considerable way towards clarifying the issues for local authorities.