25. What condition may cause a significant loss in VHF receiver sensitivity?

A reading of 9.6 when a voltmeter is connected between the positive side of the radio 's DC line and ground .
The presence of a -90dbm signal measured at the 2nd IF output with the receiver tuned to the desired input frequency.
An internal signal that is very weak in comparison to the desired signal at the output of the second IF stage.
Replacing (75 ohm) RG-59/U coaxial transmission line with a (50 ohm) RG-8/U or LMR-400 Ultraflex cable.

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