When using whip style monopole antennas (similar to those found on a Baofeng push to talk radio) as feeds for software defined radios, what “quality” of ground plane is required for best performance? Is it sufficient to connect this style antenna to the SDR via coaxial cable? Or would it be better to, say, connect the antenna to an SMA bulkhead mounted to a large metal plate (and connect the other side of the bulkhead to the SDR)?
Either way the antenna is connected to the radio via coaxial SMA cable, but in the latter case the cable shield side is also electrically connected to large metal plane via the bulkhead.
Like many applications, my definition of “better” would be to maximize gain particularly in the azimuth direction.