If you already have a TV antenna and an Android TV box like the NVIDIA Shield, then you're very close to having everything you need for a DIY Tablo DVR. Instead of picking up one of the company's boxes that can start at $180, now you can simply add its $70 USB dual-tuner device, install the free Tablo Engine app and start watching TV. At first, tuner buyers will get access to six months of guide data for free. Once the introductory period is over, however, while they can watch live TV and view up to 24 hours of guide data without a subscription, accessing 14 days of the guide and getting a one-click record option will come at a cost. The price is $4 per month, or $40 paid annually.