An access system allowing a user to access an enclosed area using a wireless user device, the access system comprising: a database adapted to store access permissions identifying at least one wireless user device authorized to access said enclosed area; a mechanical locking device adapted to secure a point of entry to said enclosed area, said mechanical locking device operably connected to at least one short-range wireless receiver suitable for receiving an unlock request from said wireless user device of the user and subsequently responding by granting access through said point of entry when said unlock request is authorized using said database, characterized in that wherein said at least one short-range wireless receiver includes a first and second directional antenna (38, 39), which are mounted to said point of entry, oriented such that the centers of the fields of reception of said first and second directional antennas are offset by an angle of at least 130 degrees, and configured to determine a received signal strength indicator for said wireless user device of the user; and wherein said authorizing the unlock request requires a comparison of the received signal strength indicator for said wireless user device of the user for each of said first and second directional antenna (38,39) such that the ratio of the received signal strength indicators indicates that said wireless user device is outside of the enclosed area. a database adapted to store access permissions identifying at least one wireless user device authorized to access said enclosed area; a mechanical locking device adapted to secure a point of entry to said enclosed area, said mechanical locking device operably connected to at least one short-range wireless receiver suitable for receiving an unlock request from said wireless user device of the user and subsequently responding by granting access through said point of entry when said unlock request is authorized using said database, characterized in that wherein said at least one short-range wireless receiver includes a first and second directional antenna (38, 39), which are mounted to said point of entry, oriented such that the centers of the fields of reception of said first and second directional antennas are offset by an angle of at least 130 degrees, and configured to determine a received signal strength indicator for said wireless user device of the user; and wherein said authorizing the unlock request requires a comparison of the received signal strength indicator for said wireless user device of the user for each of said first and second directional antenna (38,39) such that the ratio of the received signal strength indicators indicates that said wireless user device is outside of the enclosed area. wherein said at least one short-range wireless receiver includes a first and second directional antenna (38, 39), which are mounted to said point of entry, oriented such that the centers of the fields of reception of said first and second directional antennas are offset by an angle of at least 130 degrees, and configured to determine a received signal strength indicator for said wireless user device of the user; and wherein said authorizing the unlock request requires a comparison of the received signal strength indicator for said wireless user device of the user for each of said first and second directional antenna (38,39) such that the ratio of the received signal strength indicators indicates that said wireless user device is outside of the enclosed area.