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Need help with DIY wifi radio radio noise

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hongkong
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I am building a mono, internet enabled, WiFi radio and I have a problem.

I am running into what I believe may be a grounding issue. When I turn the system on, I hear all kinds of noise coming from both my computer component and my WiFi dongle.

I know that the WiFi dongle is contributing to the noise because if I remove it, some of the noise is gone.
If, I use a completely different sound source, such as a battery powered MP3 player, I get very little noise.
I am thinking I may need a ground loop isolator, but curious as to whether anyone else has suggestions.
Here is a diagram of my circuit (sorry it's a bit crude) NOTE: I am providing extra power to the USB hub because I do not believe the computer (it's a pogoplug) can output enough power over a single USB.
http://forums.radioreference.com/attachment.php?attachmentid=57304&stc=1&d=1478944070
I am using Zaph's filter (as my receiver is a HiVi B3N)
http://forums.radioreference.com/attachment.php?attachmentid=57306&stc=1&d=1478944160
And I am using a stereo to mono summing box here:
http://forums.radioreference.com/attachment.php?attachmentid=57305&stc=1&d=1478944070
Finally, I am using this LM2596S step-down transformer (LM2596S-5.0 - Texas Instruments - PMIC - Voltage Regulators - DC DC Switching Regulators - Kynix Semiconductor Hong Kong Limited.).
 

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