My feeder page on here only shows 1090MHz but I am using this antenna: https://www.amazon.com/gp/product/B07HQJKMBD/
You need two rtl-sdr receivers(USB Dongles). One for each frequency. It may work with a duplexer, however, you are generally better off with two antennas.
The advertisement just means that the antenna is capable of receiving both frequencies. In reality this antenna can receive a lot of frequencies. They just market it for dual band in this case to try to sell it to ADS-B enthusiasts. It still likely needs tuning to the used frequency.
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What about using this?
https://www.showmecables.com/2-way-coax-splitter-40-to-2400-mhz-one-port-power-passive
If not then, would getting 2 of these work?
Well since you asked, I would recommend the RTL-SDR dongle (v3). It’s in a metal case. Better than plastic for shielding and heat dissipation. Be sure to get the V3 model (not the V4).
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