Low Speed Internet - on iMac Only

Hi,
I have an early 2008 iMac running 10.9.5.
Recently the WiFi on it has been running painfully slow, compared to the other devices in my home. I thought it was due to the location in my home but it doesn't appear so as I've compared it to a Macbook.
The iMac's speed test results in download speeds between: 1.2 and 5.6 mps.
The Macbook's speed test results, when right next to the iMac: 25 mps.
Around where my airport is (downstairs), speeds on the Macbook are 50+ mps, which is what I am paying for. (The iMac is upstairs.)
Is there a way to fix this so the iMac runs at the ~25 mps like the Macbook does? Is this a general problem with Mavericks, which I've read from others?
One solution I tried which did not work is: Go To> /Library/Preferences/SystemConfiguration > Delete the files, reconnect and get a fresh reconfigure. This did not solve the problem.
Any help would be greatly appreciated!

On the iMac (machine getting the low speeds)
PHY Mode: 802.11n
Channel: 1 (2.4 ghz)
Security: WPA2 Personal
Signal/Noise or RSSI: -81
Transmit Rate: 39
On the Macbook Pro 10.9.5 (machine getting high speeds)
PHY Mode: 802.11n
Channel: 1 (2.4 ghz)
Security: WPA2 Personal
Signal/Noise or RSSI: -75
Transmit Rate: 156
Hmmm, so clearly the Macbook Pro has a much higher transmit rate. Is that fixable?

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N_e_a_l wrote:
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