I am often asked about extra antennas to use on the Baofeng radio. If you want something shorter than the RHD-771 then this is my recommendation, the Retevis RHD-701. Sold directly by Retevis via their store on Amazon. I have included the link here as I don’t sell them directly myself.
If you click through this link and purchase, I get a couple of pence back from them. However, I would not recommend them if they weren’t good.