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Here’s a quick reply. Forget 9khz and under. The government uses some frequencies slightly above that. There are technical reasons and there are also some reports of people near those transmitters suffering from headaches and a variety of symptoms while the transmitters are operating. There is not sufficient bandwidth for anything other than code.
Forget the 300 Ghz and above frequencies (light), unless you are shooting it down some fiber optic cable.
I would recommend you get some copies of the ARRL Handbooks at a nearby library or ham operator. Even editions from previous years are worth looking through. They have a wealth of information on frequencies adjacent and in the bands you are talking about. You can read about propogation, antenna design, and other information. The ARRL (American Radio Relay League, an amateur radio organization) can be found at [url]http://arrl.org[/url]
The advantage in referring to the handbooks is that you will be reading actual experiences of users of various frequencies which may be more valuable than a mathmathical calculation.