Thank you for your answer.
The thing is that I want to amplify it, by a few watts.
So would the device I linked in my original post work and how would I connect it to the HanRongDa HDR-831 ?
If that device doesn't work, what type of device should I look into ?
Also, the antenna you linked seems to be a two pole antenna (Two wires, like a + and a -)
The antenna of the HanRongDa HDR-831 seems to be only one wire
https://ibb.co/jLrLXPCI don't know the correct terminology, sorry fo the incovenience.
Thank you for the insight about antennas.