I recommend using the ABBREE AR-771 Tri-Band Radio 2M-1.25M-70CM 15.1in Whip Antenna which has a SMA-Female connection making it fit easily onto the Baofeng UV-5RM.
If you are into it, I also recommend the ABBREE AR-152A VHF-UHF 71cm/28.3in Tactical Foldable Antenna, also with the SMA-Female connection.
Currently, the radios are around $30 each, and you can probably find a two-pack of them. The antenna's are around $10 each. So, around $40 a radio is not too shabby for what you get. It is light enough where I will probably carry two of them and maybe an extra fully-charged 2500mAh lithium rechargeable battery.
This radio seems to push out around 7-8 watts of power, which is great for hiking. It can also pickup FM, NOAA weather, AM aviation band, and maybe more. The radio I purchased came with a 2500mAh rechargeable battery, and can be charged in the cradle or via a USB-C plug.