For commercial aircraft, and MilAir, I've been using a Diamond RH77CA. It works quite well!
It has a BNC connector, so it requires the BNC/SMA adapter that came with your scanner. The SRH77CA is the same antenna, only with the proper SMA connector for the BCD436HD.
I usually stick with antennas having BNC connectors, as I have more scanners that use BNC, than SMA.
For commercial aircraft, and MilAir, I've been using a Diamond RH77CA. It works quite well!
It has a BNC connector, so it requires the BNC/SMA adapter that came with your scanner. The SRH77CA is the same antenna, only with the proper SMA connector for the BCD436HD.
I usually stick with antennas having BNC connectors, as I have more scanners that use BNC, than SMA.
It was this one MFJ-1720S which has an SMA connector. Its picks up 440 like you wouldn't believe. I was hearing our local mall from 2 miles away. Its good on air band but I haven't taken it along to the airport yet.
Those Diamond ones work well also.
I probably should mention that I have an AOR8200MK3 radio not a digital capable scanner so I don't know what this will do at 800mhz