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You're assuming that cosmic background radiation is uniformly distributed. It is not. TV transmissions are most definitely not isotropic for any commercial ins
by sidewndr46 4y ago
You're assuming that cosmic background radiation is uniformly distributed. It is not.
TV transmissions are most definitely not isotropic for any commercial installation. They use directional antennas to avoid sending power directly down into the earth for example.
I'm not even aware of a single commercial radio installation with anything approximating an isotropic pattern.
- MontyCarloHall 4y agoWhile they may not be perfectly isotropic, they are far from being directional (most TV transmitters are monopoles with uniform azimuthal radiation) and would still not be distinguishable from background radiation (regardless of its distribution) at more than a light year or two away [0]. Highly directional radio emissions an order of magnitude more powerful than the strongest transmitters on Earth would only be visible at approximately 100 light years away [1]. [0] https://physics.stackexchange.com/a/245562 https://physics.stackexchange.com/a/245562 [1] https://arxiv.org/pdf/astro-ph/0610377.pdf https://arxiv.org/pdf/astro-ph/0610377.pdf