ABS works pretty well for me. Thanks!

The only way I see to sync play-state is if you use the ABS app or the web page. In ABS you can create an RSS feed for a podcast and you can subscribe to that feed in Antennapod, and the podcasts sync but their play-state doesn’t. So I’ll use the ABS on my phone instead of Antennapod. ABS is missing some nice features common in good podcast players, but it works well enough for me.