Some time back I was asking if there was any tv tuner that works with Nvidia Shield (also noticed some other ppl had asked the same thing).
I took a chance and bought the HDhomerun Connect Duo. With this network based tuner, you can watch live tv on the live channels app as well as using the HDhomerun Android TV app. However the bad news is that the EPG does not work with it.
If you use Plex Media Server with a Plex Pass, you can set it up to work with the HDhomerun and with a little tinkering you can have live tv with EPG on shield tv. I found this solution to be good for me as I don't have cable tv and my TVs do not have DVB-T2 tuners. So instead of getting 2 DVB-T2 set top box (one for my room and one for my living room) I just needed one HDhomerun and I can watch TV at both rooms, using Android TV.
Hope this info helps someone who was wondering about this. Also make sure to get the UK version as the US version is using ATSC and wun work in Singapore. I got mine for 25% off, if you have a Shield TV look in your inbox for a Shield newsletter, they had sent me a coupon code for 25% off, although the newsletter was sent many months ago it still worked in the UK site.
Also the hauppauge Dual TV tuner should also work with Plex with Plex pass on the Shield TV, however I believe it does not work with LIVE channels app.