无线电波被描述为电磁辐射中位于频谱低端的一部分，它们被用于电视广播、汽车收音机、手机基地台、GPS、Wi‑Fi 和 Bluetooth。文章说无线电波可以传播很远并穿透墙壁，而且因为低频意味著低能量，所以对人类无害。它还解释说，变化的电场和磁场会作为电磁辐射一起传播，并且能以光速在空无一物的空间中自我传播。
带有压电晶体的烤架打火器可以充当无线电发射器。当按住扳机时，晶体会变形，瞬间产生高电压，而该电压会形成电场，在空气中引发电子雪崩。加速的电荷产生变化的电场和磁场，所形成的扰动则以电磁波的形式向外辐射。如果把 AM 收音机调到刻度盘上的空白位置，当打火器的扳机在天线附近被拉动时，就能听到一声咔嗒声。
一个简单的接收器由非金属杯、铝箔球、钮扣电池和 LED 组成。铝箔球具有微小的接触点和氧化层，会增加电阻，所以一开始没有足够的电流点亮 LED。当来自无线电波的电场撞击两个球之间的介面时，它会破坏氧化层、改善连接，然后 LED 就会亮起。文章将这称为 coherer，指出 Marconi 在 1890 年代使用了镍和银屑，并说 Titanic 在 1912 年用这套系统发送 SOS，帮助救了 700 人。
Radio waves are described as electromagnetic radiation at the bottom end of the spectrum, and they are used for television broadcasts, car radios, cell towers, GPS, Wi-Fi, and Bluetooth. The article says radio waves can travel vast distances and pass through walls, and that they are harmless to humans because low frequency means low energy. It also explains that changing electric and magnetic fields travel together as electromagnetic radiation, which can self-propagate through empty space at the speed of light.
A grill lighter with a piezoelectric crystal can act as a radio transmitter. When the trigger is held down, the crystal is deformed, producing a high voltage for a split second, and that voltage creates an electric field that drives an electron avalanche in the air. The accelerating charges create a changing electric field and magnetic field, and the resulting disturbance radiates outward as an electromagnetic wave. If an AM radio is tuned to a blank spot on the dial, a click can be heard when the lighter trigger is pulled near the antenna.
A simple receiver is built from a nonmetal cup, aluminum foil balls, a button cell battery, and an LED. The foil balls have tiny contact points and an oxidation layer that increase resistance, so there is not enough current at first to light the LED. When the electric field from the radio wave hits the interface between two balls, it breaks up the oxidation layer, improves the connection, and the LED turns on. The article identifies this as a coherer, notes that Marconi used nickel and silver shavings in the 1890s, and says the Titanic used this system in 1912 to send an SOS that helped save 700 people.