The answer is no, a satellite television system operates on a different radio frequency than a Wi-Fi or any wireless local area network system. There is no reason why these signals could interfere with each other.
For example, a Dish Network satellite signal operates in the C band ranges, which is between 4 and 8 GHz, or the Ku band range, between 12 and 18 GHz. A Wi-Fi system operates in S band frequencies of 2 .4 to 5GHz.
Also, a Dish Network satellite signal is in electromagnetic or radio form only until it reaches the LNB, after which it is converted to an electrical signal. When you enter the house (which is often the case), the signal is already in an electrical form that shouldn’t interfere with any Wi-Fi signal.
Now, there are many things that can interfere with a Wi-Fi signal, or at least dampen it down to be weak enough. Then the next thing you know, the internet becomes too slow, or worse, you have no connection.
Common household devices that emit radio waves may be suspected of interfering with your Wi-Fi system. Cordless phones, baby monitors, car alarms, microwave ovens, and even bluetooth devices used in game consoles are all suspect for Wi-Fi interference. There are ways around this, some simple and some as complicated as switching to a completely different product, such as using corded phones instead of cordless phones, or using DECT cordless phones that use different frequency ranges. For some devices, you may need to simply relocate the offending device or Wi-Fi modem.
Also, you need to consider the Wi-Fi network itself. Wi-Fi signals can typically travel about 100 feet or 30.5 meters, after which you’ll use range extenders or repeaters to increase the range of the router. Physical barriers such as walls and doors can block the signal, so keep all of these in mind as well.
Lastly, a Wi-Fi signal is susceptible to rain fade, just like a satellite dish setup. Water is an excellent absorber of radio signals, so you can expect signal strength degradation during heavy snowfall, rain, or storms.