Reliable Wireless Technology

Good Day,

I have been asked by a rich client to configure for his home a wireless Internet connection. His home is big with 5 floors and a swimming pool outside. He would also like to have access to the internet while outside. Access to the internet should be fast everywhere in the house. For the moment he has a Dlink Router DI 614+ that he keeps upstairs. Internet connection is great when the laptops are in the same room as the router and they start to become weak when the laptops is transported 1 floor below. Reliability of Wireless Internet connection is unacceptable to him and he would like to improve it. He asked me to do just this.
I do not have much experience with wireless technology and this is why I am asking for advice here. I would need an extremely reliable device with access points. I would hate to install the technology in his home only to find out that it works sometimes and not other times. I need something 100% reliable. Which company should I buy the technology from?  How many access points would I need say for a 5 floor home? How about the adapter cards.....from which company would I need to purchase these from...ohhhh....all the wireless adapter cards are integrated in the 5 laptops they changing network adapter cards is not an option.

Any help would be greatly appreciated,

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Hi Tacobell2000,
It does not sound as if money is much of an issue and therefore I would suggest something like the Cisco access points which are designed for companies. You can combine them with a good high gain antenna to get good range.
With a large building the only way to to make sure it works is to install an access point and test the signal strength throughout the house and install additional points as required.
Tacobell2000Author Commented:
I was also thinking of Cisco. I would like to prepare a proposal for him with 2 choices. 1 of them Cisco and the other say something less costly. Do you know of any other company that is less costly?

HP do some good kit including extended range antenna and also support power over ethernet which can help with wiring issues.

There are lots of 'home user' manufacturers which may do additional antenna. For example:-

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cheaper way would be to install repeaters.
not sure if there's one that works with D-Link routers.
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