Watch Justin McAllister’s presentation on simple antennas suitable for a zombie apocalypse and two things will happen: you’ll be reminded that everything antennas do is amazing, and their reputation ...

Astronomers, using a simple radio antenna in Australia, detected a signal at 78 MHz, interpreted as the absorption of background radiation by hydrogen gas ionized by the universe's first stars, ...

The magnetic loop antenna is a familiar sight in radio amateur circles as a means to pack a high performance HF antenna into ...

A new simpler, cheaper and potentially more effective way to prevent radio antennas from picking up unwanted signals has been created by researchers in the US. With further development, the technique ...

WASHINGTON — Researchers have developed a new metasurface-based antenna that represents an important step toward making it practical to harvest energy from radio waves, such as the ones used in cell ...

Sometimes, it is useful to transmit a low-power radio signal to create a beacon, to send a signal carrier to a near receiver, to transmit in QRP or QRPP mode, and so on. The circuit shown here is very ...

Their approach uses a simple radio antenna operating at low frequencies to measure the absolute radio intensity of the sky. Cosmic hydrogen atoms can emit or absorb light with a wavelength of 21 ...

The basic design of the radio antenna hasn’t changed in a century. The antenna is usually a set of metal rods roughly half the size of the wavelength they are designed to receive. The electric field ...

"Whip" antennas—those long metal rods that used to extend from our cars—look pretty cool in a Smokey and the Bandit kind of way. But for military vehicles, they're not such a great solution. Troops in ...