/** @return true if one of the transmitters is active, false if they are all off. */
public boolean isActive() {
for (WirelessTransmitter t : getTransmitters()) {
Location loc = new Location(Bukkit.getWorld(t.getWorld()), t.getX(), t.getY(), t.getZ());
Block block = loc.getBlock();
if (block.getState() instanceof Sign) {
if (block.isBlockIndirectlyPowered() || block.isBlockIndirectlyPowered()) {
return true;
}
}
}
return false;
}
