Wireless 802.11n Range Question

There should be no problem with legality of any mainstream adapter or antenna you can purchase. I would guess the "rules" that apply to wireless adapters are for total RF power output. Some antenna's are better at using this power than others, thus the "hi-gain" claim. You almost always lose directivity as the gain increases, meaning, you will need to aim or orient the antenna towards the source for best results. With very tight directivity of antenna's, you can get much more than 1,800 mtrs. Check out the Can-tenna on Wikipedia. If you pointed two "cantennas" at each other very accurately, you could probably get some pretty impressive range. There are some that actually make a sport of this, seeing how far they can establish a wireless link.

Tom D.

If you were to connect a high gain Ariel up to your USB, it is feasible to transmit several miles.

Ariels are not governed by any regulations, only the power output of the units.

The gain of the Ariel is a function of its ability to concentrate the Radio waves.

For example, an omni directional has no gain as the power goes everywhere. If you add a reflector to the omni then some of the power goes in one direction. This Ariel now has gain, and the more reflectors and directors you add the more the power output is concentrated in one direction and thus more gain (simple explanation).