Has you seen an wifi so fast and have long range coverage? its according to this table below.
Wifi Coverage at it's best is 802.11n, peak at 250m range outdoor. and amazingly 70m range indoor. WOW!!!
802.11 Protocol
Freq (GHz)
Bandwidth (MHz)
Approx indoor rangeApprox outdoor range
m (meter)ft (feet)m (meter)ft (feet)
-2.420 20 m 66 ft 100 m 330 ft
a3.7/ 520 35 m 115 ft 120 m 396 ft
b2.420 35 m 115 ft 140 m 462 ft
g2.420 38 m 125 ft 140 m 462 ft
n2.4/520 - 40 70 m 230 ft 250 m 825 ft
ac520/40/80/160 35 m 115 ft 240 m 792 ft
ad602,16 60 m 200 ft 100 m 330 ft
ah0.9 - m - ft - m - ft
aj45/60 - m - ft - m - ft
ax2.4/5 - m - ft - m - ft
ay608000 60 m 200 ft 1.000 m 3.300 ft 
the latest breaktrough is ac model, which come out at end of 2015, and new device that is released in 2016 sure have ac compatibility, which have many bandwidth coverage. and reach new maximize download speed.

for range comparison graph, you will found out below:
from the left: standard, a ,b, g, n, ac, ad, ah, aj, ax, ay

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