Satellite terminals can become targets as soon as they turn on their uplink transmitter (and possibly even in receive-only mode unless their IF oscillator is perfectly shielded, which it probably isn't). This is why Musk tweeted to Ukrainian users "Turn on Starlink only when needed and place antenna as far away from people as possible." [0]

[0] https://www.dw.com/en/ukraine-is-using-elon-musks-starlink-f...