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The VHF input will not pass the UHF frequencies. The first review shows the frequency response of both input ports
The output will be from both antennas at UHF frequencies and primarily VHF from the VHF/UHF antenna (UHF antennas will receive some VHF, but at reduced gain. The UVSJ is to separate the UHF and VHF bands so that when the signals are combined on one cable there will be no phase cancellation. Trying to combine a UHF only and VHF/UHF antenna may lead to problems in your case on UHF.
it DOES. you need to ground the cable entrance into your cabin. like a deep ground rod and a gas tube arrestor for the center conductor.
they look, like this:
https://www.amazon.com/Lightning-arrestor-Bulkhead-Coaxial-Protector/dp/B07F38TSXY
as far as grounding the antenna, i would leave that for a HAM guy to comment
Don't forget your adapters
F Type to SMA Male Female Coax Connector Coaxial Adapter 2 Sets 6 Pcs https://www.amazon.com/dp/B07D28P28J/ref=cm_sw_r_awdo_3ZQCAYXS29DXAZSZPD7R
exgoofit SMA Male to SMA Male Plug Connector 5-Pack + SMA Female to SMA Female 5-Pack Jack RF Coaxial Adapter Connector https://www.amazon.com/dp/B07FDHBS19/ref=cm_sw_r_awdo_7EHDPN4F0PYRD3E27E92
Rfi, lol, I had to toss a couple tv/monitors, I got ferrite clips on everything, but the ones sold on Amazon don't state the mix ratio they are made of, so might be just placebo on my part. Keep your dongle as far away from you pc,monitor ect as you can, I use these
DTECH 15 Feet USB 2.0 Extension Cable USB A Male to A Female Cord - 5 Meters - Blue https://www.amazon.com/dp/B01HEQ1BUU/ref=cm_sw_r_awdo_D34NS919JSXP3NVJ39GN?psc=1
15cm^3 is a pretty tight constraint. I'd probably go with some kind of panel antenna like this for something dialed in around 2.4ghz.
https://www.amazon.com/Tupavco-TP542-Panel-WiFi-Antenna/dp/B015QF7EMK
I wonder if something like this would do the trick to get your reflector covered a bit easier than laying down foil or tape. Problem I'm betting is that on PETG which is my prefered outdoor filament it is likely to have a hard time bonding to the surface well. If you do test this I would be quite interested to hear your results.
https://www.amazon.com/MG-Chemicals-Conductive-Coating-Aerosol/dp/B01MQ165E3
I was also thinking of tackling antenna design via 3d printing, but the only electrically conductive filaments I can find with sort of lower resistance are PLA and ABS, and even then the resistance looks quite high compared to copper speaker wire. Then there is the issue that PLA wouldn't do too well in the outdoors over time, and my printer isn't really equipped for ABS yet.
If your radio has an external antenna connector you can add a directional antenna such as this:
If your radio does not have an external antenna connector you can purchase one that does and connect a directional antenna.