304.8 mm

It does have a decent loop area in between the signal and return path and any flux passing through it will induce noise. This area is too small for 60 Hz, but there’s a lot of microwave crap that would get picked up. If there isn’t a low-pass analog filter before the next silicon junction then this RF EMI will get rectified down. If it’s a sufficiently bad situation then you’ll hear it. That’s why you can hear garbage when you put your phone right next to crappy computer speakers.

Wi-Fi has constant retransmissions. This adds perceptible latency because the checksum check, turnaround, and packet transmission add a lot of time compared to the speed of light through air across 3 meters.