@slents I personally would never let a basenji off leash unless in a fully fenced in area. Too much risk, if the dog goes you can not stop them. Once gone they are likely to get hit by traffic. Come commands work right up until they don’t, none of mine would give me a second thought if a squirrel or rabbit appeared.
Having said that, much depends on your situation and outlook. In their native Africa they are all off leash and do fine, but very little traffic and they are used to flush out small game. If you have an environment with no traffic for a long distance and put a GPS collar on, then I have no doubt it’s less dangerous.
They love to have some freedom, so I use a good quality 26ft medium flexi leash. It’s a good compromise but you have to learn to use them safely and keep constant attention while walking.