AMPLIFIER ANTENNA OUTDR [Misc.] Channel Master Spartan 3 Model 0068DSB Antenna Signal Booster (Preamplifier)  Digital and HD TV Signals  VHF UHF FM Signals  Gain: VHF 16dB - UHF 23dB  Input: 75 Ohm  Downlead: 75 Ohm  Indoor Power Supply  Full Lightning and Surge Protection  High Gain and Ultra Low Noise for Fringe Signals  Switchable FM Traps provide Full FM Control when needed  Uninterrupted Operation even under the harshest environmental conditions  Ultra Linear Transistors improve output capability for optimum signal handling  Mast Mounted Amplification Unit with Indoor Power Supply connects via coaxial cable  Model 0068DSB  Instructions Included  Retail Price $64.99 The Channel Master Spartan 3 Model 0068DSB Antenna Signal Booster (preamplifier) with included indoor power supply will amplify digital and HD signals received by your antenna. This antenna amplifier is a high gain, low noise amplifier used for weak signal areas to allow a weak signal that is present at the antenna to be amplified to a viewable strength. This preamplifier is a perfect choice even if you are in a strong to medium strength signal area but are still having troubles receiving the weakest signals. This preamplifier is also used to distribute your signal with a digital splitter to multiple locations throughout your location, because splitters reduce the signal output signal strength (signal strength is reduced by loss in the splitters). The preamplifier consists of two units: the preamplifier itself and a power supply. The preamplifier is mounted on the antenna boom, on the mast as close to the antenna as possible or in an attic. The power supply unit is mounted indoors. Power is supplied to the preamplifier unit through the coaxial cable transmission line. The preamplifier is located as close as possible to the antenna feed point because the weak received signal must be amplified before it loses signal going through the coaxial cable, and also before it can be subjected to interference from sources between the antenna and the receiver. Preamplifiers mounted farther from the antenna usually amplify (magnify) the interference along with the signal.