Dual Pol = Cross polar antenna. BTW, quad pol antennas are also available in the market these days. I am talking here about mature markets like Europe and North America. In some cases (even if it is rural environment) more antennas sticking out of the buildingds are not preferred due to aesthetics. So dual pol antennas rule. But yes, these are about 1 dB inferior due to lower signal de-correlation achievable.
RK