Magic basically works via intent of the caster and direct transmission of magical energy (space and time matter in magic). Spells are visible in the air between the target and the wand for a reason.

I wouldn't even compare the radio to cameras and mirrors. In the case of reflecting or refracting surfaces, there is still (obstructed) line-of-sight for the magic to work over. It's still light, it still works off the same physical principle. But TV or radio... that would be a different story. The information gets converted by equipment to a completely different carrier. I'd say that TV/radio transmission protocol can't carry magic, only the harmless (maybe annoying) physical component of the scream/stare. Even in the muggle world, you can't transmit UV over TV, or ultrasound over radio (unless the protocol was designed to do so specifically). So we have to assume that the magic (the spell that's carried by the sound or the stare) is not converted into radio waves and back.

Even over a magical carrier signal (wizarding wireless network) you would also have a hard time transmitting this. Essentially, it would be have to recast the spell on the receiving end, which should then work to transmit other kinds of spells. For radio, that is against basic conservation laws - even with magic, it should take more effort to cast a spell on more people. The number of receivers in radio transmittion is basically limitless, so this would multiply the magical energy without an apparent source. The same (worse) problem is the possibility of recording and playing an infinite number of times. That shouldn't work at all. It's sort of like showing you a photo of a basilisk (if one could take a photo of course). You probably wouldn't get petrified. However, this also offers a clue to how this works: the spell cannot be transmitted to film, but destroys the equipment instead (Colin's camera). So translating this to the mandrake, its power might explode the microphone and fry the recording equipment, but wouldn't pass through.

I'd say we are safe.

Magic basically works via intent of the caster and direct transmission of magical energy (space and time matter in magic). Spells are visible in the air between the target and the wand for a reason.

I wouldn't even compare the radio to cameras and mirrors. In the case of reflecting or refracting surfaces, there is still (obstructed) line-of-sight for the magic to work over. It's still light, it still works off the same physical principle. But TV or radio... that would be a different story. The information gets converted by equipment to a completely different carrier. I'd say that TV/radio transmission protocol can't carry magic, only the harmless (maybe annoying) physical component of the scream/stare. Even in the muggle world, you can't transmit UV over TV, or ultrasound over radio (unless the protocol was designed to do so specifically). So we have to assume that the magic (the spell that's carried by the sound or the stare) is not converted into radio waves and back.

Even over a magical carrier signal (wizarding wireless network) you would also have a hard time transmitting this. Essentially, it would be have to recast the spell on the receiving end, which should then work to transmit other kinds of spells. For radio, that is against basic conservation laws - even with magic, it should take more effort to cast a spell on more people. The number of receivers in radio transmittion is basically limitless, so this would multiply the magical energy without an apparent source. The same (worse) problem is the possibility of recording and playing an infinite number of times. That shouldn't work at all. It's sort of like showing you a photo of a basilisk (if one could take a photo of course). You probably wouldn't get petrified. However, this also offers a clue to how this works: the spell cannot be transmitted to film, but destroys the equipment instead (Colin's camera). So translating this to the mandrake, its power might explode the microphone and fry the recording equipment, but wouldn't pass through.

I'd say we are safe.