If it's not going through walls, I think 50m should be doable by most modern WAPs.  If you want to be serious though, you probably want 'beam forming' technology that improves point to point connections.  The new Airport Extreme with 802.11ac handles this:

http://www.macworld.com/article/2044247/review-speedy-networking-makes-apples-new-airport-time-capsule-a-good-buy.html

---
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On Fri, Jul 19, 2013 at 9:32 AM, Amarjit Labhuram <amarjit.labhuram@gmail.com> wrote:
Hi guys,

Does anyone deal with or know where I can get a long distance wifi router to provide a range of about 50m radius and with good speeds. I am looking for something that can allow me to access a network between 2 buildings. 

I saw this device and thought something like this can help me: http://www.ampedwireless.com/products/r10000g.html

Have a great day!

Warm regards,
Amarjit Singh Labhuram.

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