Yep, then you need antennas with a male SMA connector.
Might I suggest this one - just taken from the list on eBay - for the UK suppliers you’ll probably need to telephone them to find what stock they have and whether they have an SMA one.
https://www.ebay.co.uk/itm/RH770-SMA-Male-Dual-Band-High-Gain-Telescopic-Antenna-for-Walkie-Talkie-VX-A6X2/232804234421?epid=18019375493&hash=item363436b4b5:g:bnsAAOSwNdRbIIG5
£5.59 and free P&P from Hong Kong.