Here’s a cheapo frequency generator with air antenna. Don’t know how well it works but probably worth it. This one is from eBay but I’m sure they are widely available. Also saw a plastic case for it. You will also need L-rod(s). If nothing else you can practice and see if you can get it to work for you instead of paying thousands$$$. Also I think you can situate the antenna aimed upwards for 360 coverage or aim it at the suspected area for more directional. There are various options—this one is for 0.01 Hz. Probably easy to modify it to allow ground probes.
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