The signal station at Knocklane Hill consists of the low stump of an unenclosed signal tower. It is located on a low hill overlooking Dooneragh Point which features a multi vallate promontory fort and a post-Medieval fortification. The site has extensive views in all directions except inland, to the west. The site is located on farmland and can only be visited with the permission of the landowner.
The signal tower measure 5.9m across and only the western wall, which contained the chimney survives to any substantial height. The tower is not surrounded by any accumulation of rubble indicating the stone had been removed for use elsewhere.
The internal features on the western wall demonstrate the central fireplace flanked by alcoves with a vertical drainage channel at the north that would have brought rain water from the roof to the semi-basement, the slots of the floor that separated it from the ground floor can just be seen at ground level. These feature allow the tower to be orientated and the northern and southern walls would have featured four windows whilst the eastern wall would have featured the first floor doorway.
A unique feature of the site is found at the south west corner. A 20cm wide square hole is built into the wall. It is not clear whether this represents a second drainage channel built into the mass of the wall or if it held some sort of timber support within the wall.
The promontory fort to the west of the signal station is a particularly impressive element in the landscape. The presence of the post-Medieval fortification, poorly understood, within the promontory fort emphasises how the strategic importance of this location has been recognised over a very long time span.