That doesn't tell me anything about band or frequency. Antennas, as I'm sure you've figured out, are frequency dependent/tuned devices, so you need one designed to cover the frequencies you want.
If any of those agencies have frequencies that fall in the 30-50MHz range, you will really benefit from an antenna designed for that specific band. With low band, it's even going to work better if you have the antenna specifically tuned to the frequency you are listening to.
If the agencies are in the 150-174, 450-512 or 700/800MHz bands, then the Larsen would be a good choice.