@User: (1) If you're connecting to a vendor cell like an I/O pad, you don't have much control over the routing from the pin to any antenna-mitigating diffusion; (2) you don't have much control over what the routing tools do during synthesis, although there has been a lot of work recently on making the OpenROAD tools antenna-aware and able to fix them automatically; and (3) the antenna ruleset specified by SkyWater has an equation for the ratio relative to the connected diffusion, so that for any diffusion you might have connected to your net, you can always make the net long enough that it still violates the antenna rule. I think (3) is the answer to your question. I have seen foundry process descriptions where the antenna rule was only checked for wire segments not connected to diffusion, and the check would not be done if the wire segment was connected to any diffusion at all. Not so, according to the SkyWater antenna rules. Unfortunately the rule description talks about "diode bonus" factors and is generally a lot harder to understand than it needs to be.