Violet

Hi, a few weeks after installing a ne system, these strange violet icons appeared when inserting SD-cards etc. Not that it bothers me but does anyone knows where it comes from? https://imgur.com/f7nz7pb

I am in the hill country of Wimberley, Texas, currently have a twenty-plus year old outdoor UHF-VHF antenna, previously was receiving 6 to 7 San Antonio stations, and now I can't receive any signals. We have a Radio Shack amplifier on the antenna, and have now purchased two Tivax coverter...