Putting a microwave next to a TV antenna can potentially have negative effects on TV reception. Microwaves emit electromagnetic radiation in the 2.4 GHz frequency range (the same frequency used by most Wi-Fi routers and some other wireless devices). This radiation can interfere with the signals received by the TV antenna, especially if the microwave is emitting a strong signal.
The interference from the microwave can cause temporary disruptions in TV signal reception, leading to pixelation, picture freezing, or complete signal loss. The severity of the interference will depend on the microwave's power, the distance between the microwave and the TV antenna, and the quality of the TV antenna's shielding.
To avoid interference, it is best to keep a reasonable distance between the microwave and the TV antenna. If you experience issues with TV reception when using the microwave, try relocating the microwave to a different spot or positioning the TV antenna away from the microwave. Additionally, using a high-quality TV antenna with good shielding can help reduce the chances of interference.