Check the listing for details. Radio Shack Archer 75-Ohm Coax Variable Video Gain Amplifier 15-1102. Color: Black, Condition: New, Made in United States. Listed at 17.88 USD. This Archer 75-Ohm Coax Variable Video Gain Amplifier is a vintage unit that was manufactured in the United States. It has one input and one output and is designed to amplify video signals with a non-linear process. The unit has a black color and is in good working condition. This amplifier is perfect for use with radio shack and has several features that make it a great addition to your audio and video setup. It can adjust the strength of video signals, improve signal quality when playing or copying a video tape, and functions as an attenuator to help stabilize recording. With its convenient design and signal quality, this amplifier is a must-have for any audio and video enthusiast.