Tw3740, should it use aluminum plate?

Reach Module / M+ / M2 Getting started
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For this tw3740, should I use aluminum plate? Or not?
Thank you

IMG-20170313-WA0018.jpg648×1152 57 KB

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Its recommende to use 100mm groundplane by Tallysman
http://www.tallysman.com/wp-content/uploads/TW3740_TW3742_Datasheet_rev2_8.pdf

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Thank you @TB_RTK.