I am pretty much a scanner junky
I've got scanners coming out of my ears! Don't even know how many I have now. ha ha. I am also a ham radio operator, but I just really love to know what's going on, so I have scanners in every room of the house, in every car I own, in my shop, scanners I carry around with me, scanners in my parents house so when I am visiting them and forget my hand held scanner, I can still hear what's going on. I even used to broadcast my home scanner online over
RadioReference.com - Scanner Frequencies and Radio Frequency Reference . I'm sure you are probably aware of RadioReference.com by now if you have been researching scanners and things. But if not, definitely keep that website in mind. That is where you can find all of the frequencies used in your area.
The GRE 500 is an excellent scanner! And you will most definitely need one just like it with Digital capability to receive most emergency radio traffic in bigger cities. Most cities, and even a lot of small towns are switching over to digital now, and without a digital scanner, there is absolutely no way you will be able to listen to them.
The other good portable digital scanner is the Uniden BCD396XT. That's the one I have. But I personally think the GRE 500 is a better scanner. I've never used one though.
Very few radio transmissions are actually encrypted. With a digital trunking scanner, you will be able to listen to just about everything except for cell phones. A lot of people are under the false impression that "Trunking" or a "Trunked system" is a form of encryption, or that they do it to keep you from being able to follow the conversation. It is true that you will not be able to follow the conversation very well without a trunking scanner, because their transmissions change frequencies so often. But that's only incidental to the way the system is set up, and not a way to keep you from listening. All a trunked system is, is a radio system that is set up usually in the 800MHZ range, that uses multiple frequencies, and allows multiple agencies to use the same radio system without interfering with eachother. I still don't entirely understand myself, how the whole thing works. But I know that their radios continuously change frequencies, and each agencies radios change frequencies together, so that each agency still has radio communication. So when you program a trunking scanner, it knows what frequencies to follow for any given agency as you have it programmed. RadioReference.com will show you what all the frequencies are, and if you pay for a monthly account, and get the programming software for you scanner, you can just easily import all the frequencies and trunked systems right into your scanner.
As for antennas..... I love the glass mount ones because they are kind of stealthy. But their reception is not the best, and like fireman5199 said, they tend to be hard to keep together. The antenna part keeps wanting to come loose. The part stuck to the glass should stay there good as long as you clean the glass really good with rubbing alcohol before you stick it. But yeah, the best antennas are either mag mount, or NMO mount antenna's. Radio shack sells a very good working magnet mount scanner antenna. But yeah, there are plenty of them for cheap on Ebay, and pretty much any antenna on the outside of your vehicle is going to make a huge difference on what you can receive.
Hope that helps. I saw the title to this thread and said "Oooh! Scanners! I'm all over this one!" Ha ha
Here's something to keep in mind about Florida too:
[SIZE=-1]Florida Scanner Law
843.16 Unlawful to install radio equipment using assigned frequency of state or law enforcement officers; definitions; exceptions; penalties.--
(1) No person, firm, or corporation shall install in any motor vehicle or business establishment, except an emergency vehicle or crime watch vehicle as herein defined or a place established by municipal, county, state, or federal authority for governmental purposes, any frequency modulation radio receiving equipment so adjusted or tuned as to receive messages or signals on frequencies assigned by the Federal Communications Commission to police or law enforcement officers of any city or county of the state or to the state or any of its agencies. Provided, nothing herein shall be construed to affect any radio station licensed by the Federal Communications System or to affect any recognized newspaper or news publication engaged in covering the news on a full-time basis or any alarm system contractor certified pursuant to part II of chapter 489, operating a central monitoring system.
(2) As used in this section, the term:
(a) "Emergency vehicle" shall specifically mean:
1. Any motor vehicle used by any law enforcement officer or employee of any city, any county, the state, the Federal Bureau of Investigation, or the Armed Forces of the United States while on official business;
2. Any fire department vehicle of any city or county of the state or any state fire department vehicle;
3. Any motor vehicle designated as an emergency vehicle by the Department of Highway Safety and Motor Vehicles when said vehicle is to be assigned the use of frequencies assigned to the state;
4. Any motor vehicle designated as an emergency vehicle by the sheriff of any county in the state when said vehicle is to be assigned the use of frequencies assigned to the said county;
5. Any motor vehicle designated as an emergency vehicle by the chief of police of any city in the state when said vehicle is to be assigned the use of frequencies assigned to the said city.
(b) "Crime watch vehicle" means any motor vehicle used by any person participating in a citizen crime watch or neighborhood watch program when such program and use are approved in writing by the appropriate sheriff or chief of police where the vehicle will be used and the vehicle is assigned the use of frequencies assigned to the county or city. Such approval shall be renewed annually.
(3) This section shall not apply to any holder of a valid amateur radio operator or station license issued by the Federal Communications Commission or to any recognized newspaper or news publication engaged in covering the news on a full-time basis or any alarm system contractor certified pursuant to part II of chapter 489, operating a central monitoring system.
(4) Any person, firm, or corporation violating any of the provisions of this section shall be deemed guilty of a misdemeanor of the second degree, punishable as provided in s. 775.082 or s. 775.083.
Attorney General's opinion of the law:
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[SIZE=-1]http://www.afn.org/~afn09444/scanlaws/laws/scanner/opinion.html
The term "installation" is not defined in the statute. However, this office has stated that the term contemplates that the unit be connected to a power source and have need of an external antenna capable of rendering the unit functional. Thus, this office concluded that the elements of "installation," for purposes of s. 843.16, F.S., would be present when:
[/SIZE] The radio unit is in some way connected to and dependent upon the motor vehicle's electrical power system; and the radio unit is connected to an independent and external antenna capable of receiving broadcasts of law enforcement agencies.
So, looks like unless you have a ham radio license, or are a fire fighter or something it is actually illegal to have your scanner hooked to an external antenna there.