If it's permanent, get a big one with low-loss cable. For walking around, I use the Rokland 2.5 dBi 🎉 8" antennas. They're tuned really well and the range is probably as 😀 good as it's going to get. They're thin and light, so they don't strain 🔥 that SMA connector. In the end, though, altitude 👍 trumps antenna 😂 every time.