What does 802.11N change about any of this? I made a double-long cantenna from some large spaghetti sauce cans years ago and it worked wonders. Then 802.11N b

What does 802.11N change about any of this? I made a double-long cantenna from some large spaghetti sauce cans years ago and it worked wonders. Then 802.11N became widespread and suddenly all the cards had multiple RPSMA connectors and antennae. Can anyone confirm how 802.11N has changed the recommended use patterns of can antennae? Should I have the same cantenna on each connector, or should they be different to provide differences in signal path for 802.11N magic to work? Could use of (well positioned, well made) can antennas actually make the performance worse than the stock 802.11N setup?