Hello Ido, the on-board Wi-Fi module from Murata supports 5 GHz - I have tested it. As for the antenna, perhaps you can find some information in the schematics here: i.MX 8M Mini Evaluation Kit | NXP ?
Hi Ido
for rf and antenna design one can ask additional documentation on wifi vendor portal
wireless.murata.com/eng/products/rf-modules-1/wi-fi-bluetooth-for-freescale-i-mx.html
Best regards
igor
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