ARRT-Antenna
Introduction MW Antenna Vidin (Bulgaria)- ARRT TypAn '''ARRT-Antenna''' (Cyrillic: АРРТ) is the designation of a common type used on many AM broadcasting sites in former Soviet Union, Bulgaria and Albania. It consists of a cage antenna which is mounted around the lower parts of a mast radiator insulated against ground and insulated from the mast. The mast and the cage antenna are fed separately.The ARRT-antenna allows a radiation pattern with less skywave radio propagation and is more easily realizeable than a mast divided by insulators.A variant of ARRT-antennas uses a grounded mast and a cage antenna reaching from the bottom to the top of the mast. Such antennas are used e.g. at the mediumwave masts of Bolshakovo transmitter.
See also * Zarya
External links *  Pictures of a broadcasting station in Russia with ARRT-Antenna*  Theory of ARRT