use amps only if the link quality is very high and there is no noise. because amps will amplify noise also, and the situation will get worse. there are better ways to make good links.
how? ask people who have serious links:
http://forum.mikrotik.com//viewtopic.php?p=19765&highlight=#19765
wel am about to try out everything i v learnt from this site tomorrow so i should let you in on what i think 2morrow
well guess what i think i fixed the problem. it was the transmit side of the pcb amplifier that was faulty. i changed it to a 1w hyperlink. well the link seems to be back to normal except that i couldnt test with long range clients. but clients could connect like be4