Antenna Power

I have a Microsoft MN 700 Wireless router and am trying to find out what the antenna power rating is. There is nothing in the user's manual and I have found nothing on the MS website. I am looking to replace the existing antenna with a high gain antenna to improve data throughput amongst the wireless router and five wireless devices (4 computers and 1 printer), all in a two story house and basement. Wireless router is in the basement and three computers are on second floor of house with "low" to "good" reception. Any help appreciated regarding what antenna I should be using.

Doug

The MN-700 antenna is not easily replaced, the antenna is soldered to a coax cable which is then connected to a mini-pci card.
https://fjallfoss.fcc.gov/prod/oet/f...ive_or_pdf=pdf

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