STS-119 is targeted to launch at 9:20 PM Wednesday evening local time, or 0120 Thursday UTC. The flight is going to the International Space Station to add the last solar panel. Launch window is therefore only a few minutes.
NASA TV has begun coverage. Booster Recovery Vessels and range operations will begin soon, and they will be audible on HF. Cape Radio has been heard testing on all frequencies. Specific loggings have been made on 6550, 10780, 11548, 13212, and 14937 kHz USB. There are usually a few other low frequencies that light up closer to launch. Keep watching this and other blogs for hits.
Also go to http://www.nasa.gov/shuttle for latest NASA info.