What is the advantage of communication via C band?

Yaa, I too have observed that most of the radars are working in C-Band.Can any one share the reason for this? Is it something related to atmospherice attenuation?

C Band (4.0 to 8.0 GHz). This band lies between the S and X bands and
can be described as a compromise between the two. It is difficult, however, to
achieve long-range air surveillance radars at this or higher frequencies. It is the
frequency where one can find long-range precision instrumentation radars used
for the accurate tracking of missiles. This frequency band has also been used
for multifunction phased array air defense radars and for medium-range
weather radars.