This model is produced in 2 modifications: 3 Beam - P - passive and 3 Beam - A - active. This model is 3 Beam passive modification. Nice solution if is not foresee what kind of antenna is necessary for signal detection. The amplifier is possible to buy separate and it is very easy attachable to antenna. Amplifier in well-protected fully shielded metal housing reflecting all unwanted signals. Cable connection is housed inside the connection box, so being protected against rain.