Completely forgot about Local on the 8s! I remember when I was much younger (probably around 12 or 13) I was obsessed for a while with how it worked on DirecTV- there was a national feed that was being played as normal, but when that started there was also some signal sent that (if you were lucky enough for it to actually work) would cause the receiver to generate a few static images for the saved zip code that were styled to look like Local on the 8s, and those would just be shown on top of the national feed. Best video I could find of it was https://youtu.be/WX2KQHJ8vHA (usually it was not synced that well to start and finish with the actual national feed, from what I saw it was pretty often you'd see the first few seconds or last few seconds of the national feed).