John, I'm a little confused. We may be looking at two different boxes. Are you sure you checked out the Stream+ specs? It has two OTA tuners along with its streaming capabilities.
https://s3-us-west-2.amazonaws.com/downloads.channelmaster.com/Sheets/Stream%2B+Spec+Sheet+Jan+9+2018.pdf(The blue text below is my emphasis.
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Features 4K, HDR and 3D viewing technology
Integrated Voice Search
Two internal ATSC 1.0 tuners
Works with all TV antennas Pause, rewind and record live TV*
Watch one live program while recording
another*
Record two live programs at the same time while watching a recorded program or using a streaming service*
Certified Android TV 7.0 Nougat
Google Play store access for streaming services, games and more
Built in Google Cast (Chromecast) functionality
Subscription-free Live Channels program guide*
Subscription-free Live Channels DVR*
Quad-Core processor for high end gaming and running simultaneous apps
Built in 802.11ac WiFi (Dual Band) and Ethernet
Dolby Digital and Dolby Digital+ audio support
MicroSD slot for DVR storage, up to 512GB
(USB functionality coming soon)Hardware Quad Core ARM Processor
4KP60 UHD 10-bit HEVC
HDR-10
SD or HD, Up to 1920 X 1080
4kp50-60, UHD Up to 3840x2160 Connections
Connections RF Port (ATSC 1.0 Dual Tuner)
HDMI Port (2.0 with HDCP 2.2)
Optical Audio Port (SPDIF)
USB Port ( USB3.0)
Ethernet Port (10/100BaseT)
MicroSD Port (Class 4,6,8,10 and UHS I)
Wireless 2.4 Ghz /5 GHZ WiFi Dual Band 802.11ac
Bluetooth 4.1
What's Included In The Box Stream+
Quick Start Guide
IR/Bluetooth/Voice Remote
2 AAA Batteries
Power Supply
1 Year Limited Hardware Warranty
Optional Accessories 128GB MicroSD Card
Silicon Remote Control Case
Game Controller (coming soon)
HDMI Cord
Outdoor Antenna**
Indoor Antenna**
*Requires MicroSD Storage
**Model Dependent on Inventory