Grounding a wire antenna ?

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Grounding a wire antenna ?

I am setting up a 10-meter WSPR beacon using a Raspberry Pi 4, a TAPR 10-meter hat and
a piece of wire hanging out the window of my apartment for the antenna.

I can solder the antenna wire to the center of an SMA connector.
BUT ! What do I do about grounding the antenna ?
Do I have to ground it ?
If I need to ground it, where and to what do I do so ?

73 -- KC1JNU