Puneet was a bit wrong about omni directional thing. From what I understand now, Omni directional means equal transmitting power for all directions. Also, is the zone of coverage a sphere or is it a cylinder/ doughnut with the antenna as the long axis. Its more likely to be the latter, otherwise why do devices feature more than one antennae?
So Haisaikat, one should look for a router which will feature detachable antenna(e) that can be replaced with something more powerful? And I am still not getting good signal, its just that I got signal where there was none earlier by this small change.
Yes I think one should look for detachable antennas and if you see some router or pci wifi card's manual that have more than one external antenna then they say keep the two antennas at right angles (or 120 degree) to one another (tilted rather than keeping both vertical).
I am all set for trying the modding experiment on my WRT610N with high gain antennas, placed order today