Dual-Band 2,4Ghz / 5Ghz Omni WIFI Antenna

Some time ago I needed some 5ghz antennas - this is the first thing that I bought.
Dual-band 11a/g 7/5dBi Indoor Omni Antenna from trendnet.
The papers says :
Frequency Range
802.11a: 4.9 ~ 5.875GHz802.11b/g: 2.4 ~ 2.5GHz
Gain
802.11a:7dBi802.11b/g:5dBi
VSWR
2.0:1
Polarization
Linear, vertical
HPBW/ Horizontal
360°
HPBW/ Vertical
802.11a:25° 802.11b/g: 35°
The stupid thing is that on the site specification and in pdf data sheets was said that this antenna have VERTICAL polarization, but now I can see that omnidirectional pattern came whit horizontal polarization