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Hopefully this makes sense. If the router has for example 3 antennae then by upgrading one you go from having 3 connections on the outer edge of the range to having 1 connection somewhere a bit better(in the pic that's the red one).
Your adapter then goes "great, crank up the speed" and sends all 3 on the new higher speed, 2/3 of traffic goes by the other 2 antennae and now fails so will have to be resent.
Atleast that's my vague understanding of how wifi works.
Hmmm... the channel is quite busy, but no more so than it was before and I'd have thought that the stronger signal I now have, would improve that situation: it has worsened it.
Are you saying that two directional antennae are needed?
No, my end hasn't been upgraded: USB dongle in a cantenna.