The Heatmiser EA-1 aerial extender works with the RF range of wireless controls to give a signal boost to the UH8-RF wireless wiring centre. Radio Frequency communication is easily effected by certain materials like metal that can cause the signal to weaken or be blocked entirely. The EA-1 aerial is ideal for instances like these where installations have the UH8-RF wiring centre is installed in a metal cupboard. It is highly recommend to install the EA-1 aerial in larger properties in order to extend strong signal coverage to all rooms.