omnidirectional

This is sort of a dumb question, but why develop omnidirectional treadmills instead of omnidirectional footwear?

The gain is 100% due to to the recycling cavity and omnidirectional nature of phosphors.

In the case of omnidirectional signals expanding in a sphere, they attenuate at a rate of 1/r^3.

Immersive VR requires at least some space to move around in, or set up a big omnidirectional treadmill in.

It isn't simulated properly by slippery shoes, but can be on a (large, military grade) omnidirectional treadmill.

The vision was possible.[1] You can have multiple PAs, wide-bandwidth omnidirectional antennas, replicate front-end filters, etc.

I guess, the antenna does not have to be omnidirectional as long as the attacker can search around the direction the key is likely to be.

Signal/noise issues would favor a low power omnidirectional emitter placed near a receiving dish, roughly in the known signal path.

And we'd be very unlikely to pick up the omnidirectional beacon of a lonely civilization way out here anyway.

It's likely an omnidirectional antenna on the satellite and a (very directional) tens-of-meters ground station (or series of them) following the satellite's position.

Even with an omnidirectional antenna the signal of distant x-ray sources is so faint you most certainly could overpower it for large distances.

Even if there is no signal reflected usually, wouldn't this amplifier be more or less omnidirectional (they don't know where your key is right now).

Sounds a lot like "VHF omnidirectional range" (VOR) which dates back to 1946.

Omnidirectional radio broadcasts need a comparatively huge amount of energy.