Extends the range of WiFi equipment. The antennas can be used to increase the range of the equipment or to increase the signal level thereby increasing the link speed. The rubber duck antenna screws directly into the existing external antenna port of your wireless equipment. Your wireless equipment must have removable antennas for this to work. Some antennas are not removable. Check your equipment first. The antenna swivels 360 degrees and tilts up to 90 degrees with detents at 45 and 90 degrees. Compare to the 2dBi (typical) stock Rubber Duck antennas that come with your router or access point. - 7 inches tall - 1.5x the range vs 2dBi stock equipment antenna - Works with any 802.11b/g/n WiFi equipment. This listing is for one antenna. Price is for one antenna.