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The UVSJ is a filter made of some combination of inductors and capacitors. The UHF port does not pass frequencies below channel 14 (470 MHz). Most UVSJ designs allow DC to just over 216 MHz (the upper end of channel 13) through the VHF port.
The losses are relatively low, about 0.5 to 1.0 dB for signals in the pass-bands. Frequencies outside the pass-bands are attenuated 20 or more dB.
As far as preamps go, the power is fed up the coax from inside the building. The amplifier should be located within a short coax jumper length of the antenna. It would be quite unusual to locate the power supply on the roof or outdoors, most are not rated for such installation.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 25-May-2011 at 8:45 PM.
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