Wi-Fi extenders and password cracking software?

For five days out of every single week, I find myself away from home due to my work travels—essentially living out of a suitcase—and I am looking to bring a small laptop along so I can stay connected to the internet. Within a roughly 100-yard radius of where I stay, there are about ten different wireless networks, all of which are password-protected.
A friend of mine actually sent me this link suggesting I look into this specific offer, but I am honestly torn—is this a legitimate solution for my situation, or is it just some clever way to scam people out of their hard-earned money?
The seller claims to be offering some sort of Wi-Fi booster equipped with an antenna capable of picking up weak signals from up to 500 meters away—which sounds plausible enough—but what really confuses me is the claim that they also sell software designed to scan for locked networks and unlock them without any trouble.
Is this actually technologically possible, or is it just a complete fraud? Because if it works the way he says, it implies that anyone could just hop onto my own Wi-Fi network whenever they felt like it.
Does anyone here have any insight into

A friend was just telling me—and I have to agree—that pulling this off would be virtually impossible without having some pretty serious technical expertise under your belt.

restlessdrifter12 said:For five days out of every single week, I find myself away from home due to my work travels—essentially living out of a suitcase—and I am looking to bring a small laptop along so I can stay connected to the internet. Within a roughly 100-yard radius of where I stay, there are about ten different wireless networks, all of which are password-protected.
A friend of mine actually sent me this link suggesting I look into this specific offer, but I am honestly torn—is this a legitimate solution for my situation, or is it just some clever way to scam people out of their hard-earned money?
The seller claims to be offering some sort of Wi-Fi booster equipped with an antenna capable of picking up weak signals from up to 500 meters away—which sounds plausible enough—but what really confuses me is the claim that they also sell software designed to scan for locked networks and unlock them without any trouble.
Is this actually technologically possible, or is it just a complete fraud? Because if it works the way he says, it implies that anyone could just hop onto my own Wi-Fi network whenever they felt like it.
Does anyone here have any insight into

The only way you’re breaking the law is if you’re using an antenna and software like that to try and crack someone else's password. When you boost the signal, you’re boosting everything—including interference. Plus, there's a 100mW power limit set by the FCC here in the States, so you'd be violating that too.
Cracking WEP encryption is pretty easy, but trying to get through a complex WPA3 password? That's way harder, almost impossible.
Another thing is, even if you use an antenna like that to "snag" a free hotspot, most of those places block certain services anyway.

No worries, I won't be touching that.
I just don't quite wrap my head around how someone can openly sell such things without being held liable for inciting a crime—it simply doesn't make sense to me.

You just don't get how ownership works. You can buy a device and totally legally hack your own gear if you, say, forgot your password. You're working on your own equipment for research, testing hardware, or developing algorithms, who knows?
A seller isn't responsible for your bad intentions any more than a guy selling a chainsaw is responsible if you decide to go terrorizing the neighbors with it...
The device itself shouldn't even be on the market because it exceeds the allowed power limits for this class of gadget. It probably belongs in a different category altogether—one that, I'm guessing, requires special permits...

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You’re going to need a high-quality Wi-Fi adapter, and you really should look into getting Linux Backtrack installed on your machine. That’s pretty much all I can say about it, since I don't want to get flagged by the mods for breaking any forum rules.

Is it better to get mobile data for a phone or a laptop? I honestly have no idea,
then you're actually safe. I wouldn't want anyone hijacking my network and potentially causing chaos using my IP addresses, leaving me to prove it wasn't my fault.
I’m sure there are people here who know how much mobile data costs on a cellular network.

Does anyone happen to know what this "minidwep - gtk" thing is actually for?
I’ve been sitting here watching this video trying to figure it out, but I can't make heads or tails of any of it since there's absolutely no sound coming through