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I'd recommend a Mikrotik routerboard http://www.mikrotik.com
What do you want to achieve with your hotspot?
You need RADIUS Manager doing the processing and MikroTik's hotspot system or pfSense pointing to the customers.
This is not child's play. To get this lot working to that level you will need at least two months.
I trust this is an academic excercise. The 2.4GHz spectrum is now so congested that you can hardly get 50m range between a radio transmitting at legal levels and a laptop on the Greater Cape Town area. Using high power radios with high gain antennas that can transmit further will not only get the Powers That Be on your case, but will also make you no friends amongst the people who are transmitting at legal power levels.
To get back to Radius manager, I have looked into that option a couple of nights ago, but I thought, well, maybe I can use something free on the internet without having to take a risk of -$99 if I failed
Viktor will install it remotely on your computer and give you a 30 day free trial.
However, I would suggest studying the manuals beforehand.