Referring to your original drawing, Tim.
The UHF antenna has the Antennas Direct PA 18 preamp on the mast.
The power inserter is before the splitter/combiner inside.
The VHF antenna is using the Winegard preamp.
Using Rabbit73's explanation above for the LNA 100, it is also on the antenna side of the splitter/combiner.
Hope this is the info you were looking for.
Thanks.
PS: First opportunity, I will replace the Winegard with my second PA 18 preamp
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