Any chance for DIY 2m/70cm combiner?

Hallo nice ppl.

Is there any chance to build a DIY 2m/70cm antenna signal combiner out of the spare part box?

If not: What about such a thingy?

Funny btw:

Ooooookay :joy:

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Arrow Antenna have a duplexer to combine the 2m and 70cm antennas on a single coax.
K0LEE has a nice explanation of a design by KI0AG on his website.