One can not just put an OTS antenna on the PCB and expect it to perform well without impedance matching. It will need to be impedance matched with a production level device including battery, enclosure, cables, connectors, and LCDs. All of these will impact the antenna impedance. In order to maximize the efficiency the customer needs to tune and match the antenna with the complete assembly. The Certifications: FCC Part 15B - Unintentional Radiator, Required for any electronic devices with clocks and switching. It is much more difficult to pass than years ago. Faster clock speeds (shorter wavelength) means smaller structures on PCB are effective antennas. As much as 80% of fully functional digital designs fail FCC certifications. The FCC SAR (Specific Absorption Rate) – if the device will be within 20 cm of the human body, do a Maximum Permissible Exposure (MPE) calculation to determine if SAR certification is required. But certification does not necessarily mean the customer will have good wireless performance. Especially troublesome are sub-GHz receivers such as LTE Band 13, 3G at 850 MHz, MICS/MEDS, 433 MHz, and 319 MHz.