said by Mike Wolf:The problem is 5GHz drops out at longer distances so he would only be able to go a fraction of the distance before the connection speed between the router and wireless device becomes too slow to use compared to the distance with 2.4GHz.
it's true that 5GHz is far more attenuation sensitive than 2.4 GHz (metal, water are great absorbers and the higher the frequency the worse it is at penetrating) however 2.4 has to compete with a huge number of other users and uses (radar, microwave ovens, electronic ballasts (florescent and high pressure lighting)) are common EMF pollution sources.