Problem With Wireless N (Wi-Fi) Expander / Booster?

Ok, now:

I've got a very poor signal from my landlord's flat on basement floor as I'm located on 3rd floor. My laptop doesn't see it without my TP-Link TL-WN822N 300MBPS High Gain Wireless N USB Adapter. With this thing I'm getting 4/5 bars, it works awesome!

Problem is that I need internet not just for my laptop, but for 2 iPhones, tablet, my xBox 360 and another laptop. (I tried to share internet connection through this laptop which works OK for another laptop, but doesn't work on tablet, iPhone or xBox) So I 'found' a solution: Proxima Direct® 300Mbps Wireless Wi-Fi Repeater 802.11N Network Router Range Expander. It does what it says, it extends the signal. Apparently it has very weak receiving antenna cuz expanding antenna works fine. First day I was so happy to see 5/5 bars on all devices, so I didn't even check internet speed. Now, this extender barely sees 1-2 bars of actual router in the basement, so speed is super low.

So, I'm wondering, is there any of those expanders (obviously quite cheap ones, like 20-30 quid), that has a powerful receiving antenna, like one on my USB adapter? Ot has anyone played with it to actually connect a more powerful antenna to it, like 9dB one or something?

I was considering getting something like Powerline Network Extender with wireless antenna built in, but my landlord doesn't want to use it. Obviously for some silly reasons, so this thing doesn't work.

Any ideas, solutions are appreciated, or if you have same or similar problem - please write what you tried, did and what happened?

I'm pretty sure the landlord doesn't want you hogging all that bandwidth in the first place! Secondly, if the landlord only has a wireless G router, your wireless N is useless. It will only connect at G speeds anyway.

Don't buy a repeater, it will cut your bandwidth in half no matter how high the signal. Read about it.

Run some Ethernet cable from the first router to another router and use it as an access point. Google how to do this.

Also the other guys talking rubbish about N and G speeds as that only applies to network speed not internet speed.

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