Radio output power  of internal Airport Extreme

Does anyone know what the Radio Output Power (dBm) is for the built-in Airport Extreme 802.11n in the Intel iMac (MA876LL, MA877LL, MA878LL: http://support.apple.com/specs/imac/iMacMid2007.html)?
For example, the power output for the Airport Extreme base station is 20 dBm (per specs: http://support.apple.com/specs/airport/AirPortExtreme_Base_StationN.html).
I'm wondering whether I would achieve better wireless connectivity by deactivating the built-in Airport and plugging the iMac via gig-ethernet into an Airport Extreme that is operating as an extension of a wireless 802.11n network (assuming that the AEBS has better array of antennae, radio output strength, etc.).

Can anyone tell me their experience using the MBP built-in airport to create a network? How powerful is it, how far is the range?
The built-in AirPort in your MBP was primarily designed to be a wireless client ... not a router. Although OS X allows your MBP to perform as a "software" router, my experience is that it is somewhat limited.
As far as range is concerned, this type of wireless network would only be good for a relatively small area ... like a single room.

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