Your WiFi router runs on either 2.4 GHz or 5 GHz, or both in some cases, and those frequencies are so far away from the ones used by DTV that interference isn’t really possible.
But no, a TV antenna will not “kill” a WiFi signal.
What can interfere with WiFi signal?
Bluetooth devices, cordless phones, baby monitors are the examples. Also such appliance as microwave may be generating the radio frequency noise and as a result the network may be slower or disconnect. Cordless Phone — again 2.4 GHz spectrum. Just like previous item these phones can cause large signal interference.
Can WiFi interfere with cell signal?
The answer is no, Wi-Fi has no effect on cellular service. It’s technically impossible for Wi-Fi to interfere with cellular connectivity because each technology runs on different frequencies. “Can WiFi Interfere With Dropped Cell Phone Calls?”
Can a baby monitor interfere with WiFi?
Many baby monitors operate at 900MHz and won’t interfere with Wi-Fi. However, some wireless monitors are 2.4GHz, which can interfere with 802.11g or single-band 802.11n routers. Alternatively, get a Wi-Fi-friendly system such as the WiFi Baby 3G ($279), which connects to your existing wireless network.
Can thick walls affect wireless Internet?
In theory, Wi-Fi signals are capable of passing through walls and other obstacles relatively easily. However, in reality, some walls are thicker or use reinforced concrete and may block some of the signals. Materials such as drywall, plywood, other kinds of wood and glass can be easily penetrated by wireless signals.