Which diplexer to make/buy

Where can I buy a diplexer to use with satnogs? I saw some PCBs for it on oshpark which will require soldering and components.

If I find something assembled than I could buy.

If you mean combining/splitting UHF/VHF I use an MFJ duplexer,

https://www.mfjenterprises.com/Product.php?productid=MFJ-916BN

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Thanks for the link @cshields