The range of a Wireless LAN will be dependent on many factors, which makes predicting actual useful range difficult. The sensitivity of the transceivers plays a part, but range will depend on the amount of noise and interference present in the environment. The position and construction of walls and partitions can also affect range. One significant further factor is the type and positioning of antenna used, and this is an area that the user or installer can influence. The Antenna should be located away from any walls or metallic objects. It should be as high as possible and at least 120mm off the ground. Higher gain antennas can be used to improve the range by focusing the transmitted and received radio signals. Omni-directional antennas give coverage at 360o, and are suitable for home or office environments where a broad coverage is required. They work by focusing the RF signal into a flattened dish. Directional antennas give narrower beams and potentially much higher distances. They are more suited to applications where the users are not mobile, for example linking a remote workstation or linking two buildings.