US vs Iran
The STRAIGHT FLUSH fire control radar has a maximum range of 55 - 75km and a 10,000m altitude capability depending upon the conditions and target size, and performs limited search, low altitude detection and/or acquisition, pulse Doppler IFF interrogation, target tracking & illumination, missile radar command guidance and secondary radar missile tracking functions. Some modified fire control (STRAIGHT FLUSH) radars use a TV camera with a 30km range to enable the battery to remain in action even if the vehicle's radar is jammed or forced to shut down due to threats from anti-radiation missiles. This radar can also be linked to the launch vehicles by either a radio data link or a 10m long cable for direct data input to the launcher's systems. The data link antenna is carried on the right forward hull corner of the TEL. It also carries the fire control computers for the SA-6 Gainful missile battery.
The foldable 28km range dish antenna is of the conical scanning type and is used for low altitude H-band sector search scans, target tracking and target illumination. The lower parabolic antenna is the G-band medium altitude target acquisition and early warning radar with a 55-75km range, with the lower feed for medium to high altitude coverage and the upper feed for low altitude coverage.
The STRAIGHT FLUSH fire control radar can begin target acquisition at its maximum range of 75km, and begin tracking & illumination at 28km. The STRAIGHT FLUSH radar can only illuminate a single target and control three missiles at any one time so normal practice when a target track has been initiated is to normally order the launch of two and sometimes three weapons from one or more TELs. 
Dr. Abbas Bakhtiar