We have a couple of locations around Los Alamos that are RF dead zones. Locations that should have a good signal, but are marginal or non existent. Sometimes even with line of sight to the tower. I've always assumed it was because of severe radio interference in the location, or maybe even related to the lab. One is near a large electrical yard and another near a major Lab Electrical Subcontractor. So it may not be jamming, but some sort of other severe interference or radio phenomena.
Robert via CM9 Kindle Fire using Forum Runner