Heathfield (HFD) tall tower is in rural East Sussex, 20 km from the coast. The closest large conurbation (Royal Tunbridge Wells) is located 17 km NNE from the tower. The area surrounding the tower is >90 % woodland and agricultural green space with some residential (0.7 %) and light industrial areas (0.3 %)(East Sussex in figures, 2006). Notable local industry includes a large horticultural nursery located only 200 m north of the tower.