Replace wifi antenna

Hello,

just swapped the internal 3TB HDD for a 2GB SSD. The small antenna on the on / off switch has loosened. now i’m thinking about swapping this antenna for a stronger model. could be gladly placed on the outside.
it looks like easy to solder off and on. only problem, most antennas are dual band. but 2.4 and 5 GHz are separated on the board.
Does anyone have an idea?
I imagine that the connection problems could disappear as a result

Best regards
Matt

an example for antenna: Amazon.com

What device do you have? My passport wireless? My passport wireless pro?..

it´s a My Passport wireless pro.

Sorry, mine is MPW.