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Most Yaesu 2mFM radios will only transmit on freq settings from 144.105 to 147.995. This keeps the FM deviation from going out of band. On FM if your center frequency is 148 the upper half of your deviation would be out of band, so Yaesu is courteous enough to prevent that.
Most can be...
Actually, I count two, but only one you can easily measure.
There is the impedance transition between the tranceiver and feedline (the one you can measure) and the one between the feedline and the antenna (the one you adjust).
If your feedline is really 50 ohm impedance and your tranceiver...
The quarter wave groundplane should work very well, with a minimum of trouble. It will have the same gain as a dipole, but should have a very consistent omni-directional pattern if mounted with nothing around it.
If you are in an area with repeaters within a few miles, even up to about 15 or...
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