Antennas on copter - lambda/4 ground?

Hello!
I have a general question to antennas.
Is it better to have a “lamda/4 - groundplane” on the copter?
I use 433MHz openlrsng and connect it directly to the rx. Also with 2,4GHz Video
My understanding of antennas is that i need a lamda/4 ground that it works good…

br
Arnold