This isn't exactly skip but I thought it would be interesting to share this mornings experience. I had been searching the 403-420 band for federal comms and had several hits on Motorola control channels. I ran Unitrunker on the systems and found that they were 6120 4732 and A73B. A search of RadioReference showed two of the systems in Montgomery County Maryland and one of the systems in Richmond Virginia. I was very suprised to have picked up these systems from Harrisburg using a standard discone antenna. The current conditions of the ionsphere must be great for radio traffic.