Recent FCC regulatory proceedings have opened up the 18 and 28 GHz bands for certain types of multichannel television distribution. It is, therefore, of some interest to CATV operators to compare the atmospheric propagation characteristics of microwave transmissions at 18 and 28 GHz with the more familiar 13 GHz CARS band. The effects of multipath and rain attenuation at these frequencies are reviewed and the method of predicting path performance is summarized. Pertinent examples delineating performance limits of . existing systems are given.