The argument raging over LightSquared's proposed LTE network and possible interference with GPS services is actually two arguments over two sets of frequencies, both of which the startup hopes eventually to use. One of the bands allocated to LightSquared, called the "upper band," sits right next to spectrum set aside exclusively for GPS (Global Positioning System). Its "lower" band is farther from the GPS frequencies but has been used by satellite services that make GPS more accurate. In both cases, the signals from LightSquared's LTE (Long-Term Evolution) towers would be stronger than those of the satellite-based services. But beyond that, the issues are very different. Read More