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Just to be certain, has the cable service been disconnected completely?
If you connect an antenna to a cable service drop, even one that is only providing internet access service, you risk causing harmful interference to aircraft communication and navigation as well as other licensed radio services. Given that you're right under the instrument approach path to Seatac you could expect someone to notice quickly.
You should be able to disconnect the cable company service drop from the splitter, then connect the antenna to the splitter input. In your situation, a high-input preamp such as the Antennas Direct CPA-19 or Winegard HDP-269 could be used to overcome splitter and cable losses.
But before you spend money on a preamp, be sure that the antenna is connected to the input port of the splitter, not an output port. Good splitters will have a great deal of loss between output ports.
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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; 3-Jan-2012 at 8:04 PM.
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