Sorry for the curt response. Wireless abuse, cracking and the like are a sore subject to me. People are way to paranoid, and there are a lot of buttheads abusing what was once good unobtrusive fun. Some of this text is
from a previous post.
I would head over to sites dedicated to WiFi, like Airshare.org (a great place to start) to learn about war driving/walking/bikeing(which you know about) and packet cracking, injecting etc...
There are only two modes to use a transceiverin , active or passive mode. Suggesting that you want to use a second card with "kick ass range" in active mode with Kismac (a tool I highly recommend) is suspicious to most.
I use a number of wi-fi tools, and Kismac is one of my favorites. There are few legitimate uses for having a second wifi system set up in passive or active mode. One is [URL=http://en.wikipedia.org/wiki/Link_aggregation]Bandwidth or Link Aggregation as noted in this Mac Rumors thread[/URL]. Bandwidth aggregation is a better term.
Just think about what your doing and think about the consequences of what your actions might be to others.
Preaching done. I would look at Hawking technologies, as well as devices that use Lucent designed chipsets/cards. I don't know if there is an injection driver for the Hawking tecs device yet, but if your looking to prove that your more than a tinie script kitty, write your own. If your really into this, do your own research. I know the info is on the Internet.
Hawkingtech offers a nice little portable external wifi router (HWL2A) (with high-gain antenna) that will double as a wifi locator (looks a little like a StarTrek tricorder).
For non invasive passive scanning, I would look to iStumbler or MacStumbler. As far as I know they can't save or scour individual packet dumps, unlike Kismac. iStumbler has a widget interface now (cool) and I think iStumbler has better resolution. Technicly, if your running a second 802.11.x transciever, you should use these tools, as it is easyer to remain more ethical.
Please don't be an ars with the tools or information you gain. I preach that people should provide free access to their Internet when they can, so violating others trust by cracking their security and/or hacking their computer is just stupid. It violates the Social Contract, as well as a number of laws.
Beside, if you get caught by somebody else who knows how to use the tools better than you... well I hope it happens to any malicious ars (Which I guess you are not). At worst, somebody traces back your signal and uses a directional antenna with a transmitter with a wicked amount of power to fry your wifi system, or computer. (Indused EM harmonics can cause so much damage.- But I digress.)
Have fun! Getting caught by the numbers police or the FCC really sucks!!!!!!, but getting caught by somebody that previously trusted you is even worse.
Head these last words.
What are you up to?
