Review on HDMI Booster 2.0: Enhance HDMI Signal with Flashmen 4K2K 1080P 3D Amplifier - 18Gbps Bandwidth, HDCP 2.2, Up to 60m/200ft Transmission Distance by Adam Ross

Installation: ROKU Ultra Box - to ONKYO Audio Receiver - a 50ft HDMI cable. - to a SAMSUNG HD TV. It is not possible to use two 25ft cables in a wall mount with the amplifier placed in the middle, which is recommended. Problem: Unable to stably receive 4K 30Hz signal from Roku box. It doesn't receive any 60 Hertz signal at all. Can only support 1080p signal with 100% efficiency. Solution: A 6 inch HDMI cable (the shortest I could find) was built into this amp/repeater. Result: I now get HDMI 4K output at 60Hz and 30Hz with a 50ft HDMI cable. 30 Hz at 100% efficiency. 60 Hertz Approx. 80% depending on the strength of the incoming signal. Very satisfied as this has been a problem for quite some time. Bottom Line: This works for a single 50ft HDMI cable.