Unlikely to be any different to what we see now with 3G or 4G data modems. The transmit power is limited by licensing/approvals. 5G is only transmitting over very short distances, hence there is no need to have increased power levels in the home with a 5G data modem. An external directional antenna would not only ensure the best connection, it would also minimise any RF in the home if that were a concern for some.
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