That's the tricky part... if you're going for legal and license-free you're pretty much left with the ISM bands and very limited transmit power. There's nothing stopping you from getting a real spectrum license and narrowband licenses in the 2m and 70cm bands aren't actually that expensive but there's also equipment certification requirements, generally.
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That's the tricky part... if you're going for legal and license-free you're pretty much left with the ISM bands and very limited transmit power. There's nothing stopping you from getting a real spectrum license and narrowband licenses in the 2m and 70cm bands aren't actually that expensive but there's also equipment certification requirements, generally.