[DonRotolo]

To emphasize a point Al made:

The tiny (2" long) antennas are mounted inside the box, at the right and left sides, oriented from front to back. And, metal is a good "blocker" of radio waves.

So, if you want POOR radio performance, then you must mount the radio:
1. Behind metal
2. On metal
3. With the tiny antennas near metal

As far as the "Electrically Noisy" components mentioned above, these really and truly have very little effect at the GigaHertz frequencies used by 802.11 radios. The filtering on the DC input is sufficient, and the RF energy radiated by the motors does not reach significantly up into the GHz range - meaning you don't need to care about it. But don't forget, those motors are mead of metal, so see further above...

The ideal situation is to put the radio up high, on something non-metallic, like a strip of Lexan. Protected from injury, but not near metal. Run the power & Ethernet cables directly away from the radio, and not next to it (these contain metal - see way above...)