It boosts the signal by 15dB which is approximately the signal strength that is lost for every 150 feet of cable. The result will be a stronger signal with less chance of fade or blackout. Install in the middle of any long run of cable between the dish and the receiver. The same voltages in the cable that power the LNB also power the amplifier. No external power is required.
Tilt compensation is built in to amplify all frequencies equally.