A reflector-based antenna, comprising: a primary reflector having a focal point; an antenna feed spaced from the primary reflector and approximately located at the focal point for illuminating the primary reflector with or receiving from the primary reflector radio frequency, RF, energy, said feed forming a blockage of the primary reflector; and an RF beam-shaping element located between the primary reflector and the antenna feed, said RF beam shaping element comprising a dielectric material, wherein the RF beam shaping element is configured to direct RF energy from the feed that is transmitted through the dielectric material away from the blockage towards unblocked regions of the primary reflector; wherein the feed is configured to transmit or receive RF energy of a first predefined RF wavelength, and the antenna further comprises: a sensor opposite the antenna feed with respect to the RF beam shaping element for receiving or transmitting energy of a second predefined wavelength different from the first predefined RF wavelength from the primary reflector; and a secondary reflector having a forward surface facing the primary reflector and the sensor and a rear surface facing the antenna feed, said secondary reflector comprising a selective coating on the forward surface allowing transmission of RF energy at the first predefined RF wavelength there through and reflection of RF energy of the second predefined wavelength, said antenna feed, said secondary reflector and said sensor creating the blockage of the primary reflector; wherein said RF beam-shaping element is located between the forward surface of the secondary reflector and the antenna feed; wherein the RF beam shaping element's dielectric material is formed on the rear surface of the secondary reflector. a primary reflector having a focal point; an antenna feed spaced from the primary reflector and approximately located at the focal point for illuminating the primary reflector with or receiving from the primary reflector radio frequency, RF, energy, said feed forming a blockage of the primary reflector; and an RF beam-shaping element located between the primary reflector and the antenna feed, said RF beam shaping element comprising a dielectric material, wherein the RF beam shaping element is configured to direct RF energy from the feed that is transmitted through the dielectric material away from the blockage towards unblocked regions of the primary reflector; wherein the feed is configured to transmit or receive RF energy of a first predefined RF wavelength, and the antenna further comprises: a sensor opposite the antenna feed with respect to the RF beam shaping element for receiving or transmitting energy of a second predefined wavelength different from the first predefined RF wavelength from the primary reflector; and a secondary reflector having a forward surface facing the primary reflector and the sensor and a rear surface facing the antenna feed, said secondary reflector comprising a selective coating on the forward surface allowing transmission of RF energy at the first predefined RF wavelength there through and reflection of RF energy of the second predefined wavelength, said antenna feed, said secondary reflector and said sensor creating the blockage of the primary reflector; wherein said RF beam-shaping element is located between the forward surface of the secondary reflector and the antenna feed; wherein the RF beam shaping element's dielectric material is formed on the rear surface of the secondary reflector.