They come and they go. Late fall through early spring seems to be their preference for that lil' slice of frequencies. However, after the 9/11 attacks they were on constantly for about a year and a half. It's why we pirates moved down to 6925. No use in pissing off more than one govt. agency at a time. Especially when they have the power to send you on a free multi-year vacation to lovely Guantanamo Bay.