There are only 2 major frequencies for delivering satellite TV programming
C band delivers frequencies from 3.70 GHz to 4.20 GHz. The dish size required is 6 ft. to 10 ft. depending where you live , and if you are going to track all the satellites or just sitting your dish on one satellite. C band Big dishes can receive both C band and Ku band signals using a feed horn that will accept both Lnb's.
Ku band delivers frequencies from 11.70 GHz to 12.50 GHz. The dish size required is 18 in. to 36 in... Depending where you live , and if you are going to track all the satellites or just station your dish on one sat. Ku band dishes cannot receive C Band signals unless they are designed for it and are usually very large and the dishes are not for the average homeowner.
The best of both types is C Band, ( 5150) Lower frequencies pass through bad weather easier than higher frequencies. All Cable Companies and DSS providers acquire most of their signals by C Band. Just like with cordless phones, a 900 MHz phone will penetrate through your walls easier than a 2.4 GHz phone. 2.4 GHz. Phones do have a better range in distance in the open air but the phone base with the antenna is always in the house and the walls in your house will slow down the signal. The 900 MHz. phones will penetrate much easier but you will not have a farther distance.
Twin LNB's that's C & ku which will switch automatically are in the market, you can install this LNB just like common installation or you can get one c band LNB and one Ku LNB and use dis Q switch. Regards