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Old 15-Oct-2011, 11:15 PM   #14
GroundUrMast's Avatar
Join Date: Oct 2010
Location: Greater Seattle Area
Posts: 4,773
With the cable disconnected at both ends, you should see a very low resistance end to end when measuring the center conductor and also when measuring the shield. There should be near infinite resistance between the center conductor and shield.

It sounds like you have a poor connection at one or both ends between the connector body and shield. Poor shield connections allow signal to leak into and out of the coax. Signal energy will also reflect backward from the bad connection which will possibly radiate back into the air through the antenna, leaving you with much less signal at the TV.

Shield connections need to be solid, mechanically and electrically. If the high resistance connection is the result of corrosion, throw the cable away. Water in the cable destroys it by changing the characteristic impedance, anything other than 75 ohms is going to cause signal reflections.
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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