ATU Location With Duplexer

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KD2DSG

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Good evening guys/gals!,
New here and my first post. I did some searching and didn’t find any info so I apologize if this horse has been whipped to death previously. Can someone tell me if an ATU should go before or after a duplexer? I’m going to be splitting HF and VHF/UHF to different antennas. The duplexer is a Diamond MX-62M and the ATU is a mAT-705 which will only tune the HF frequencies. Not needed on the VHF/UHF side anyway since the antenna (Comet GP3) is pretty well tuned itself. My head is telling me to place the ATU after the duplexer on the HF ANT feed but I’m not sure of anything. TIA!!!
 

AK9R

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RadioDuplexerHF portATUHF antenna
VHF/UHF portVHF/UHF antenna
 
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