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Are these antennas interchangeable?

It's hard to say just by looking. An antenna is matched to a specific device, not only by frequency, but by impedance. If the Lilygo-T-RelayS3 has a series inductor (base loading coil) to compensate ...
DrMoishe Pippik's user avatar
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Correct connection of a Wi-Fi board having both printed antennas and U.FL sockets

This looks like a design mistake. As you correctly noted, you can't build something where "something 50Ω connected or not" makes no difference to matching. Your phrasing dual antenna Wi-Fi ...
Marcus Müller's user avatar

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