Ham radio enthusiasts might be able to help you out here.

Hams already talk to the ISS on the 144-148 MHz band (which is close to the FM radio in your car). They have about a 15 minute window to talk to the ISS. They have a 90 minute orbit, too, so I would bet similar window to talk as Artemis II.

The ISS is much closer to the earth than Artemis. Quick google tells me the Artemis is 184 times the distance as the ISS (dang!), bit inside the Van Allen belt. Our atmosphere is transparent to 2.4 Ghz, so there probably won't be too much attenuation. You would need to account for scattering of the signal - maybe use a yagi directional antenna?

In conclusion: I bet you could interfere with their wifi, but might not be able to hear their signal

My HT radio has a mode (I've never tried) for talking to satellites. It uses the GPS to get the radio location, and then manages doppler shift for the frequency as it's coming toward or going away from you. So you'd likely need something in your WiFi connection to Artemis/Integrity to deal with that.

> I bet you could interfere with their wifi

Seems unlikely. Even at perigee, a long boom YAGI 20 degree spread would be ca. 40 km wide. Mind you, the signal would still be 5 million times stronger than when Artemis II is close to the moon.