It's physically impossible for wifi to mess with DNA. You can look up the ionisation energy for the atoms that make up your DNA, look up the energy in a photon of wifi and learn why the quantity of radiation doesn't matter by learning about the quantization of light (best illustrated by the photoelectric effect).
Each of the basic Wi-Fi channels, most users have probably encountered in their router settings, are generally segmented-up during communication into 20MHz, 40MHz, 80MHz or 160MHz channels.
40MHz is not a stronger signal; it's a wider one. You'd want to stay on 20MHz in the case that your wireless devices can't exceed 30 mbps (b/g/n). 40 MHz would be a waste of bandwidth and potentially less stable. If you have devices that can reach up to 50-70 mbps, you'd want 40. Let it auto-config and forget about it. The only concern is if 20MHz for the 2.4GHz band helps to avoid performance and reliability issues, especially near other Wi-Fi networks and 2.4GHz devices, including Bluetooth devices. Auto or all channel widths for 5GHz and 6GHz bands ensures the best performance and compatibility with all devices. Wireless interference is less of a concern in these bands. The issue is that as channel width has grown from 20 MHz now up to 160 MHz, WiFi radio power has stayed the same. Every time you double the channel width, there is a 3 db penalty. So that means a 160 MHz channel will have 6 db less signal strength than a 40 MHz channel.

But wifi uses at least 20 Mhz of spectrum. So a wifi radio using 20 Mhz centered on Channel 1 will have signal going up to 2422 Mhz, well into Channel 3. A wifi radio centered on Channel 6 (2437 Mhz) will range down to 2426 Mhz, below Channel 4, and as high as 2448 Mhz, past Channel 8. And that assumes only 20 Mhz channel sizes. 40 Mhz is also

The differences in terms of range in the 5ghz band are insignificant. The lower end, the UNI-II band (channels 36, 40, 44, and 48) because they are "lower" than the UNI-IIExt band channels, will "travel" farther.but again, the differences are insiginificant in the grand scheme of things, and the better comparison is between the 2.4ghz band and the 5 ghz channels and obviously, the 2.4ghz
HmkKW.
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    • difference between 20mhz and 40mhz wifi