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Absorption
In general, low frequencies are better because they can pass through solid objects more easily. Sometimes, higher frequencies can create an advantage because they can be reused more easily. For example, cell phones use fairly high frequencies. By operating at low power, the signal from a cell tower will only travel a short distance. Another cell tower a few miles away can use the same frequency without causing interference. This allows the telephone companies to handle more connections simultaneously.
FM radio stations use relatively low frequencies (88-108 MHz), which is why you can still tune in the signal from a radio station inside your home without needing to put the radio antenna outside and there are fewer disruptions due to weather.
Cell phones use higher frequencies than broadcast radio and television. Most cell phones in the United States operate at 850 MHz or 1900 MHz--still low enough to get good reception inside most buildings. This is why you can usually get cell phone reception anywhere in a house.
Wi-Fi signals use much higher frequencies than broadcasting or cell phones. Most Wi-Fi routers operate at 2.4 GHz. This is why the Wi-Fi signal in your home tends to fade quickly.
The frequencies used for satellite television (DirecTV, DISH Network) are so high (12 GHz and higher) the signal cannot pass through walls or a roof. This is why satellite dishes must be placed on the outside of a house---and even rain clouds can cause signal interference.
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