20" imac with wifi speeds of 20Mbps,  macbook gets 52Mbps

Hello My imac gets @ 20Mbps and my ibook gets the same. But a Macbook gets 52Mbps and a windows machine  gets 52Mbps. They are all near to each other. The only one with an N card is the Macbook. Any ideas?

Exactly what model iMac do you have?
What wireless router are you using (exact make & model, please)?
If your wireless access point is running both 2.4GHz and 5GHz, check your Airport setup in your iMac  (System Preferences > Network > Airport (or WiFi) > Advanced > Preferred Networks).  If your 2.4GHz network's name appears higher in the list than your 5GHz network's name, your iMac will preferentially connect to the 2.4GHz network.  You can drag the network names in the order you want your iMac to connect.

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