Extending my home broadband Wifi beyond 5km

http://www.ebay.com/itm/Long-Range-3KM-High-Power-5800MW-58DBI-USB-Wireless-Wifi-Adapter-Antenna-Applied-/351012238114?pt=LH_DefaultDomain_0&hash=item51b9f5b322

My office is about 6km from my home & I'm exploring if I could extend my home's
Wifi to say 7km or more.   The item above only goes up to 3km.

Q1:
The items below has good Amazon ratings but they did not indicate what's the distance/range
they could extend the Wifi signal, any idea?

http://www.amazon.com/NETGEAR-N300-Wi-Fi-Range-Extender/dp/B004YAYM06/ref=sr_1_7?s=pc&ie=UTF8&qid=1424453034&sr=1-7&keywords=wifi+extender

http://www.amazon.com/TP-LINK-TL-WN822N-Wireless-External-Antennas/dp/B00416Q5KI/ref=sr_1_10?s=pc&ie=UTF8&qid=1424453034&sr=1-10&keywords=wifi+extender

Q2:
Do suggest any other devices (pls provide the URL/links to purchase the device) that could extend
the Wifi up to 7km or more

Q3:
Will the throughput drop with the longer distance?  Can this be calculated?
sunhuxAsked:
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Craig BeckConnect With a Mentor Commented:
Buy a pair of Ubiquiti NanoBridge M5 units...

http://dl.ubnt.com/datasheets/nanobridgem/nbm_ds_web.pdf

Job done :-)
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sunhuxAuthor Commented:
My current Wifi broadband modem is enhanced version of 2Wire: I can post the exact model if this
info helps with my queries above.  If it doesn't help, let me know so I dont have to post it.

I live on 11-12 storeys building so I guess it's tall enough to reach my office without much of
building hindering the signals.  If it works, my brother who stays 3km away from my place at
36 storey (about 36x 3.5m per storey) could share my Wifi too
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Only 802.11a on 3.7GHz is rate for anywhere near that range: http://en.wikipedia.org/wiki/IEEE_802.11   There are a number of point-to-point wireless systems that are used to connect LANs together but they are not regular 'wireless' or WiFi systems.  And 'wireless range extenders' barely work inside a single house and would be useless for your application.

Outdoor wireless systems will come close to what you are looking for.  Here's some from Engenius: http://www.engeniustech.com/products/outdoor-access-points-client-bridges.html   Keep in mind that you need to mount the antennas as high as you can to get longer range.  I can't find it at the moment but I saw one system that used parabolic antennas and claimed a range of 20,000 yards.
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sunhuxAuthor Commented:
http://www.ebay.com/itm/Ubiquiti-NanoBridge-M2-18dBi-NB-2G18-outdoor-MIMO-2-4GHz-/291376190978?pt=LH_DefaultDomain_0&hash=item43d75fd602

is the above M2 good enough?  M5 costs more.
Can these devices work in British Commonwealth countries or it works regardless of where I am located?
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Craig BeckConnect With a Mentor Commented:
M2 is 2.4GHz... Not recommended for point-to-point links due to the likelihood of interference, hence suggesting the M5 which uses the 5GHz frequencies.
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Here's the data sheet: http://dl.ubnt.com/nbm2_datasheet.pdf  It doesn't say what the 'range' is.  Remember, you need 2 of those.  They are Not regular WiFi, they are point to point communications.  IC RS210 means it's approved in Canada and FCC is the US.  Don't know if it's approved for where ever you are.
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Craig BeckConnect With a Mentor Commented:
Actually, they are regular WiFi.  The M2 uses the 802.11g and 802.11n standards while the M5 uses the 802.11a and 802.11n standards.  Just because you can form a point-to-point link with them doesn't make them non-standard.

The range (on the datasheet I linked) is in excess of 30Km.  That's true for both the M2 and M5.
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