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It depends on the laptop. How old is old? What is the processor speed, what operating system and how much ram? Most the newer PCMCIA wireless cards I've seen require at least a 233mhz pentium, 128mbs of ram, and windows 98 or XP.
Basically yes and no. It depends on what speed their systems run at. Even 802.11b is 11mbps. So if it runs at full B rate, then it's faster than cable. My Road Runner runs at 5mbps. I would think that the wi-fi would run between 1.5 and 3. I know that's a huge difference, but anything slower would cause complaints (even though it's free, people will still whine), and anything faster may not be cost effective for them. If you know the local company that is offering it i'd call and ask questions. They should be able to give a very detailed description of what the service is, how it works, and where it works.
the antenna will esentially be your IP. you probably just have to wait and see. as long as you get a decent signal, your b-rate shouldn't suffer too much. awhile back I was doing some work on these wi-fi systems, the ones that were being installed in McDonalds by wayport. we had minimal dropoff in the building area, but your system will much more area coverage with more people using it, which will also effect speed. just remember--no matter how fast it is it will always be too slow for some.
as long as you're not doing anything that is huge in size, downloading movies,pictures or any really big text files, the speed shouldn't affect you too much. where you'll see a difference will be on graphics intense websites, trying to open movie clips, downloading programs, basically anything that has a large filesize. other than that, you should be very happy, especially since it's free.
edit: some terms to help
802.11= simply a wireless protocol designation- at present 802.11f is current but all are backwards compatable-for instance...a 802.11b card will work on an f system just slower.
b rate=baud rate or speed. how much data is being sent or received or how large the bore of your information pipeline.
Mbps=a measurement of exactly how much information you send/receive.
sorry if I got simplistic with this. I just wasn't sure how much you DO know.
There are many 'hot-spots' around town. You can go into starbucks with your laptop and it the NIC (card) will log on to the network.
Unfortunately, i live in the boonies, so i still got the ol ball and chain 56k. . The only thing that seems promising to me is WiMax. Almost like Wi-Fi, but has a much more distance span.
Just remember your Wi-Fi connection especially for something city wide is basically unsecured and easily hacked. Use great caution when doing finance on-line.
For some reason it's not advertised much, but the stuff is out there. I contacted one company last year and the servers, APs and related, for about 2000+ customers was $35K, but the customers would be able to have T-1 speeds if they wanted. This could put a hurtin on cable and DSL, so I could see someone like google wanting to get their foot in the door.
Yeah the Mayor of San Francisco said that it's some kind of human right or something to have internet access. Glad I don't live there, just another way for them to try and raise taxes.