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Trey

I need a replacement wireless lan antenna. Do I need the same DBI or can I increase for better recep

Glen:

the higher the DB rating the better reception you will have, it will also have a positive effect on your trasmisson, you levels do not need to match, althought its worth noting that if your using extream distances (ie the max wifi distance / walls) then it would be wise to have two Hi gain, high DB ratings

but it is not nessary so in answer to your question

you do not need the same DB rating, and the higher the better. i believe 12-18 DB is around the max, in the UK at least.

Oddlike7:

12-18 in the US might be a little high...I think there is a point where the FCC wouldn't be too thrilled with you...but certainly 8-9 which would be a huge boost.

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