There are many types of emergency radios available. Some of the types of radio available include Ham radio, AM radios, FM radios, CB radios and walkie talkies.
Ham radios can be used to communicate across around 1000 miles or more. However these are strictly regulated and you can get into serious trouble if you use them improperly. For handheld radios the best quality is from a GMRS radio, which you often see plumbers and electricians employ as worktools. These also require licenses to operate within specific areas.
Modern radios are much simpler to operate. Morse code js no longer used to communicate. No need for a highly specialized person to operate tge radios.
Once you have your Amateur License, you can buy a ham radio online, you can go to a local hamvention where vendors like icom and kenwood will be selling radios, you could go to a local radio club, I'm sure they'd be happy to sell you one of their old radios at a great price, or point you in the dirrection of a local ham shop.
One can find information about the ham radio operator Yaesu on the Yaesu website. Yaesu has been making quality ham radios since 1957. Yaseu offers many different types of radios from stationary to hand held devices.
Corded telephones, letters, notes, ham radios, etc.
Legacy radios receive RF radio signals.Satellite Radios operate at the Microwave spectrum and require completely different receivers.
Speakers, microphones, telephones, radios, Etc.
It's possible for a non-ham to speak on a radio of a ham under supervision. That means the ham has to be at the "control point", or the locality where the action (talking) is taking place. But a non-ham couldn't say, be across the parking lot from him/her and use a ham radio.
You may have a Ham radio antenna anywhere in the US, unless there are restrictions as to its placement, such as in a condo or apartment. If you meant a Ham radio transmitter, then you must have a Ham license to operate it.
Well, yes. They couldn't work if they didn't emit electromagnetic radiation in the form of radio waves.
There are many uses. They're used in HAM radios, ultralight aircraft, tool handles, and tents.