A satellite dish must have a clear line Line-Of-Sight to the satellite. The largest mistake an inexperienced or careless installer will make is locating a dish where trees will partially block the satellite signal, resulting in a lower then normal signal level. ANY signal blockage is unacceptable. Even if you have a clear picture, you can have signal blockage. A satellite dish with a clear line of sight will deliver a signal average of at least 75-80.

Satellite broadcast channels are called transponders. Each transponder contains up to 20 TV channels. The minimum signal level for a transponder to provide a clear picture is about 40. Atmospheric conditions such as rain, snow and dust affect the strength of the signal. During a heavy rain storm (rain fade), you may loose some or all of your signal. If your system has an average signal level of 60, you will experience more outages then someone who has an average signal strength of 75. The satellite industry considers 70 as the minimum signal level for all transponders. Some transponders are not used and will have a 0 signal level. Others are not meant to be used in your geographical area and may have signal levels far below normal.

Do not accept an average signal level of 70. 70 is the minimum considered as acceptable, but only a few should be that low. Most signal levels will be around 75 or higher.