Best long-range network cards?

Hey everyone, I’ve got a quick question for those who might know their way around this stuff.

I was browsing eBay and saw these network cards claiming insane power and range. We're talking 6000mW output with an 18db antenna—and I even saw one listed with a 60db antenna, which sounds pretty much impossible to me. They claim a range of several miles in open space and a few hundred feet indoors. Has anyone actually messed with this gear? Is that range even remotely legit? Also, what kind of radiation levels are we looking at with an antenna like that? I could really use something with this kind of punch, but I have zero interest in throwing money down the drain. It's sitting around $200-$83. Thanks.

The chipsets inside those USB "adapters" are overclocked—which just means they push more power. But there’s a huge gap between theoretical power and what you actually get in the real world...
Those Chinese-made 2.4 GHz omnidirectional antennas? They definitely don't live up to the hype. Especially when you consider that a large grid antenna hits about 24 dBi—and we all know those things are strictly directional.
I actually have one of those "half-meter" omni antennas at my place, and honestly—it performs worse than a tiny 4-inch one.

One more thing regarding those adapters—no matter how much raw power they claim to transmit, nothing can fix a poor signal reception.
If you're trying to connect to a distant router that uses a small omni or an integrated antenna, your download speeds will tank—and that high packet loss will end up choking the router itself.

If you have clear Line of Sight (LOS), you can just use a standard antenna or even a basic adapter and get a solid connection without any extra hassle.