Wifi not working well with cover on

My Mac Mini is loosing tons of packets via wifi to my Airport Extreme. I test with a ping to 10.0.1.1 and my mac mini is on 10.01.55. If I remove the cover it works very well, packet loss is zero. If I install the cover (enclosure, whatever!), problem starts up again. If I put my hand over where the wifi antenna is, touching the side of the mini, the connection returns to normal.
I thought it was the network card so I got a brand new one, installed it and got the same packet loss. I have re-checked the connection to the board and the connector is well seated, nothing loose so it isn't that. It is also not a loose wire.
Anyone with same problem and a fix?
Thanks.

First try to change the wireless channel.
If does not help do a reset of your apple Extreme / express, and do the setup again.

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[email protected]

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Wifi not working well with cover on

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