I'm not entirely clear on this - they count as repeaters of both players, but does that mean if you have a hacker in one of the repeater zones and an enemy hacker activates, you can hack them through the repeater but apply firewall mods?
“The Transmission Antennas are Repeaters for the Hackers of both players. The Transmission Antennas don’t apply the Firewall MODs.” - The ITS9 mission scenario book