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Hello,
The WL18MODGB is FCC, RED Certified, the antenna used in any design should meet the requirements from table 5 below, taken from theWL18xx Module Hardware Integration Guide (Lit: swru437).
For information on the WL18MODGB-DESIGN-FILES for certification you can request it from https://www.ti.com/tool/WL18XX-CERTIFICATION.
BR,
Jessica M. Torres