🚀 go-pugleaf

Could I use a high-frequency op-amp as a voltage follower to amplify
the output of a little walkie talkie?  I'd like to increase the thing
to more than 100mW and get enough output out of it to boost the
effective range up to a mile or two.  Maybe up to 3 or 4 watts.

Is this possible?  Legal?  If it isn't possible, how could I boost the
signal to increase the range?

Also, can the crystals just be desoldered and replaced with different
frequencies as long as you get crystals of the same type?  Or are
other things in the circuit tuned to the crystal's frequency?

Thanks.

Adam