Advantages of RADAR

The main advantage of RADAR, is that it provide superior penetration capability through any type of weather condition, and can be used in the day or night time. Radar uses electromagnetic wave that does not require a medium like Sonar (that uses water) so can be used in space and air. Radar can be long range and the wave propagate at the speed of light rather then sound (like with sonar). It is less susceptible to weather conditions compared with Lasers.And be used at night unlike passive cameras. It does not require target cooperation to emit any signals or emission.

EDIT- Simple fix in spelling and slight expansion to previous answer