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According to some of the specifications in the Edison Module Hardware Guide, the quality of the signal is indeed affected by some devices/objects that might be placed too close to the antenna. According to the document components or metallic objects shouldn’t be placed close to the Antenna Keepout Zone (KOZ). Also, later on the document there’s a whole section dedicated to the “Antenna Keepout” (7.1), “the area around the antenna should be kept free of all components, routes and ground planes. However, most of these instructions were written thinking on PCB designers.
I believe that as long as you don’t place too many components or objects around the antenna area you shouldn’t have any issue with the quality of the signal regardless of the positioning.
Thank you for the info!