✔ 最佳答案
All scanners will receive NOAA weather frequencies, so that's covered.
Look up your area on RadioReference.com and find the frequencies for other desired services.
Be aware that many agencies, police departments in particular, have "gone digital",
and many of those are also encrypted.
More expensive scanners will demodulate P25 digital transmissions,
but no scanner will undo encryption.
Currently there are two manufacturers of scanners,
namely Whistler (producing the same items as were formerly made by GRE
but with different model numbers), and Uniden-Brearcat.
Both offer about the same features for about the same money,
and you will find reviews that favour one over the other
with severe criticism of the failings of the one not preferred.
Both sides are right and both are also wrong.
My preference would be for Bearcat for relative ease of programming,
but Whistler for certain performance characteristics.
I have models made by both Uniden and GRE,
and I find that there is little difference between them in everyday use.
For programming a radio, FreeSCAN software is very useful,
and there are others that have more capabilities,
but I haven't tried them.