An Impala? I'm sure there's enough real estate on a vehicle that size to get sufficient separation without having to resort to notch filters and other such nonsense. I've always found that mounting one antenna on the roof, and one on the trunk lid worked just fine to keep radios apart, and that was with 100 watt class radios.
Forget the "stealth" part of the equation. You lost that with the first antenna...
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12 volt radios are for wimps. Real radios can kill you.
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