First introduced in 1977, the Motorola MT-500 "Handie Talkie" is an emergency-frequency radio used by the Ghostbusters. The model used in the first film is the 4-6 channel UHF (short body), lacking both PL boards/switches or dial pads on the face. The stubby antennas are the 2.0" x 0.5" models that thin at the base. They are carried in the standard MT-500 holsters (without the straps).
The radios used in the 2009 video game are noticeably thinner than the MT-500, possibly based on the MT-2100 model. They also sport 7.0" x 0.5" flex antennas and are conveniently clipped to the left strap of the Proton Pack.
MT-500 without the Antenna, Photo by Keith Marshall
MT-500 Holster
Venkman's MT-500 with the 2.0" x 0.5" Antenna
Stantz's Radio in the 2009 Video Game - Note the fictional brand.
The radios used in 2009 video game greatly resemble the Motorola MT-2100.
