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To clarify some of the technical aspects, both Ku (BMI, DTN, etc.) and X band (CQG) transmission frequencies lie in the microwave region of the spectrum. However, according to my remote sensing and image processing references, there is a dip in the atmospheric transmission percentage of about 10% due to water absorption (not adsorption) in the Ku band, but none in the X band. So, the Ku band transmission frequency is affected to some degree by atmospheric water, especially during thunderstorms. -Tony Haas sptradr@xxxxxxxxx wrote: >I've notice that my older and much smaller CQG and Signal Equatorial >microwave band dishes do not exhibit rain fade like the 1m and larger Ku >band dishes. I suspect that the rain fade woes may be due to water >adsorption and hence greater signal attenuation in the Ku frequency band >than in the microwave frequency band. So a bigger dish size is not >necessarily better, though it can't hurt.