I've been thinking about this for a while, and if you wish to flaunt the law (not recommended) there IS a better way.

There is a modulation form known as Single Sinewave Temporal Spread Spectrum modulation (SSTSS) that is absolutely indistinguishable from noise. It works by agreeing on the specific transmission frequency using a Pseudo Noise mask much like many other forms of spread spectrum. ONE unmodulated sinewave is transmitted at the predetermined frequency, but time shifted from the predetermined time by the modulating data. Considerable distance is possible since higher power transmissions will appear as spikes, since they are just unmodulated sine waves spread 'randomly' over the band. HF bands capable of long distance propagation (over 1500mi) can even be used.

The drawbacks to this are:

1) It's illegal, even if it is undetectable.

2) Attainable speeds would be fairly low.

3) You would need some method of sync for the starting point within your Pseudo Noise mask. You could use a broadcast signal like I did with the FM bug instead of a PN mask.

4) Your mobile equipment would be quite bulky if lower frequency HF bands were used. Existing 11 meter (CB) equipment could be adapted however. 11 meters propagates well under the right conditions and the bands are CLOGGED with noise. Your transmissions would go unnoticed, but your error rate would be high.

 

So theres a method that can go large distances with a high error rate? Why even bother?

If you're trying to fool the FCC (or whatever is similar) the underlying assumption is always to assume that Oscar (the FCC) has your hardware, so you've reallly fooled no one.

 

Yes, they would have your hardware. They might even know that SOMETHING is a couple db above the noise floor over an entire octave of bandwidth...

 

Well because they pay for licenses... and you're messing with their purchased rights if you mess with their spectrum.

There aren't ANY sections of the spectrum which "aren't being used" anymore. It's a wild fragmentation, some big areas reserved for TV channels, AM FM radio, stuff you know, then you see a hundred other things, including odd stuff like a tiny sliver for emergency locating beacons for crashed planes, some locating system you've never heard of, etc etc. Everything's being used, sometimes you won't find anyone using it at that time but rest assured it's owned.

Well, CB radio and the FRS radios here in the USA can potentially go for miles with the right antenna and terrain and anybody can use them legally. However, the WAY you can use them legally is limited. For example transmitting digital data or recorded advertising is illegal even if the format is maintained.

Realistically, nobody's going to bust you if your hacked FRS radio sends a squak of digital data to announce that the mailman's opened the box. Highly unlikely anyone would ever notice. Using it for continuous comm ain't gonna fly.

People have achieved remarkable WiFi range- curiously, legally too- with directional antennas. When your angle is 0.01% the spread it had before you sure can go a long way. But you wanted omni...

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I thought what I'd do was I'd pretend I was one of those deaf-mutes.

 

There are a few frequencies that nobody CARES about because they are virtually impossible to use, such as 60Hz. Good luck building transmitters small enough to use and strong enough to get above the noise floor. Oh, and don't bother with 8 or 9Hz, you'll interefere with government mind control satellites and/or black helicopters and you DON'T want to mess with them. :P

 

The following information is provided for educational purposes only and actual effort or actions could violate specific regulations within the USA or other nations, as well as cause prohibited interference to other services, critical or otherwise.

You can mod the Linksys wireless routers to output higher RF to provide greater coverage area. A couple of students I know did their Linksys and they got well over 1.5 miles before turning it into a brick. It may have lasted a long time if they would have taken the proper cooling measures. The other part of the equation is to improve the antenna and reception of the wireless receiver card in the 'puter. Here are some links to modding the Linksys:




http://aruljohn.com/info/linksys/

http://www.dslreports.com/faq/linksys/2.1_WRT54G

http://roachfiend.com/archives/2006/...reless-router/

http://en.wikipedia.org/wiki/Long_Range_Wi-Fi

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Don't make me reach through this monitor to slap you a good one!

 

Adaptor cards can have a feedline attached and the antenna remounted in a soup can. You get about 6db (4x) of directional gain, minus insertion losses from cable and connectors.