Take a look at the 3G Repeater Demonstration video in different YouTube supported resolutions below. Watch and view the video in full screen and listen carefully to the sound effect to get a feel of what HD really means.
Standard normal quality YouTube video.
High quality YouTube video.
HD (720p high definition) YouTube video.
Tip: HD YouTube supports up to maximum picture size of 1280 x 720. So users can embed the video of bigger size by changing the width and height values in the embed code.