Express vs. Extreme: which has the longer range?

Just discovered that by hanging an Airport Extreme base station (802.11n, 10/100 Ethernet model) outside my 36th floor apartment, I can connect to the home network from the park, coffee shop, shopping mall and other areas downstairs. In fact, according to GoogleEarth, I was 554 meters (.34 miles) from my apartment this morning and was still able to download web pages to my iPod touch. Great! I can now take the MacBook Pro outside and work when the weather is good.
But I can't keep the Airport Extreme hanging on the exterior wall all the time. Too big, too heavy, to difficult to weatherproof and keep permanently attached to the wall. And I don't want to have to set it up every time I go out and then take it down when I come home. I'm thinking, however, that an Airport Express might be the perfect solution...small, light, and easy to weatherproof and leave hanging semi-permanently on the exterior wall.
So the question is, does the Express have the same range as the Extreme? Both have an output power rating of 20 dbm, but I've no idea how, or even if, this translates into an effective range. Anyone know?
Thanks!

So the question is, does the Express have the same range as the Extreme? Both have an output power rating of 20 dbm, but I've no idea how, or even if, this translates into an effective range. Anyone know?
Yes, the new 802.11n AirPort Express Base Station (AXn) should have the same range as the 802.11n AirPort Extreme Base Station (AEBSn). The 802.11g versions had an advertised range of 50' for 802.11g and 150' for 802.11b. The newer 802.11n versions have an advertised range of up to "twice the range of 802.11g wireless networks."

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Express vs. Extreme: which has the longer range?

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