A: There are currently three antennas in use:
- A ChannelMaster CM4228HD receives emissions from Sutro Tower and Mount San Bruno.
- A ChannelMaster CM4221HD receives emissions from the hills above Fremont. For reasons we have yet to determine this antenna performs best attic-mounted rather than roof/pole-mounted.
- A Winegard HD7000R (with low-vhf extensions installed) receives RF 6 from Mt. Loma Prieta.
For ATSC 3.0 we use a combination of HDHomerun Connect 4Ks (Development Edition), Airwavz RedZone Receiver RZR-1200s, and Airwavz RedZone Receiver RZR-1400s. All have their plusses and minuses.
The Airwavz RZR-1200 exposes many statistics from the tuner/demodulator and allows capture at the baseband packet level, enabling full analysis of the ATSC 3.0 payload by our stack. However the RZR-1200 is an early ATSC 3.0 device with a demodulator that struggles with dynamic multipath and weaker signals. Both the HDHomerun Connect 4K and Airwavz RZR-1400 sport the newer Sony ATSC 3.0 tuner/demodulator with rather good sensitivity and dynamic multipath performance. However the Sony tuner/demodulator processes the baseband packets internally and outputs ALP packets. As a result we don’t get a good idea of channel utilization (i.e. the actual PLP bitrate, as stuffing occurs at the baseband packet level.) The HDHomeruns also do not expose the level of tuner/demodulator information that the RZRs do. Lastly, while the HDHomeruns are more affordable than the RZRs and have two ATSC 3.0-capable tuners, we are currently experiencing stability issues where the Connect 4k will spontaneously unlock from 3.0 signal and fail to relock.