How I do it ?

Solution is very simple. You have to install alternate firmware (gargoyle, dd-wrt) on this router and configure repeater/bridge mode. I have tutorial but only in Polish - http://tplink-forum.pl/faq-alternatywne-oprogramowanie/tryb-most-bezprzewodowy%28wireless-bridge%29-i-przekaznik%28repeater%29-na-gargoyle-pl/

jimasek
Thanks for your answer,
That's mean that the router have ability to receive wifi ?

Regards.

Yes, WDR4300 can works like repeater or wireless client after firmware exchange

jimasek,
Thanks again I have few questions:
1. Which firmware is prefer DD-WRT or gargoyle(OpenWRT)?
2. The 9dBI antennas really help for the reception or it's just gimmick?
3. What's prefer TP-link WDR4300 as repeater or Netgear EX6100 ?

Regards.

I recommend Gargoyle and WDR4300 of course. I don't know Netgear routers only use Netgear switches sometimes in my job.

jimasek,
The netgear EX6200 isn't router, it's Extender/Access Point,
The difference between them:
1. netgear have 2 antennas, the tp-link have 3.
2. netgear have 1 LAN port, the tp-link have 4
3. they both 750Mbps.

Regards.

I said I don't know Netgear devices. This is TP-link forum and I'm tp-link expert :)
You have to decide in this case. WDR4300 is typical wireless router without repeater functionality in original firmware, that's all.

OK,
What about the 9dBi antennas?

Regards.

I don't know how coverage (distance) you need to embrace. Wireless coverage is sometimes like a lottery.

jimasek,
Another question please,
What's prefer,
Connect 2 cameras to repeater in wireless (and the repeater connect in wireless to main router)
Or connect the 2 cameras to repeater with LAN cable (and the repeater connect in wireless to main router)?

Regards.