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1) This doesn’t measure SWR but it does indicate antenna system resonance: http://www.part15.us/node/3829 . This may not work with the AMT-3000 system because it is tuned slightly off resonance.
2) Should work. There is also a recommended parts change for use with a base coil loaded antenna. Achieving the best performance is a matter of adjusting the coil taps, antenna length, and trimmer capacitor. You should get a manual which describes the process.