The article is misinterpreting the actual functioning of the device. It doesn't make radio waves go faster than light -- it just makes a polarization pattern
in the waves propagate along the device faster than light can. No actual mass, energy, or information is travelling faster than light, just a pattern.
The developer of the device even mentions an analogy for this in the article, referring to how you can make a point of laser light on the Moon fired from the Earth change position faster than light just by sweeping it sideways. No actual thing is moving FTL, because the reflected photons that make up the spot of light at one instant are not the same as the ones that make it up later, after it's moved. Only the pattern is technically moving FTL.
So there's no way this device could allow FTL communication or "subspace radio." The only thing Singleton is proposing is that this "sonic boom" effect with the polarization wave, basically a constructive interference pattern, could reinforce radio transmissions so they could travel
farther, not faster. Or rather, so that their intensity would drop off as the inverse of distance rather than the inverse square, so they would be stronger at a greater distance. This could theoretically allow broadcasting with much lower power, or could allow cell phones to transmit directly to satellites. (So it wouldn't be subspace radio, but it might allow something like "Kirk to
Enterprise.")
However, other scientists are skeptical that Singleton has actually demonstrated something new or practical. Here's a less error-prone article:
http://physicsworld.com/cws/article/news/19957
As I always say, whenever you read science news from a source that doesn't specialize in science reporting, it's a safe bet that they got it wrong. Particularly with "faster than light" claims. It seems that every few months for the past several years, something's been announced about effects that allow some component of an optical wave to have a phase velocity that exceeds the group velocity
c of the overall wave, something that's implicit in the equations of light that have been around for a century, and the reporters always misinterpret it as a "faster than light" breakthrough. And then a few months later they forget completely about the last announcement and report the next one as though it's just as unprecedented. But they're all just variations on the same basic Einsteinian physics and don't actually mean what the reporters hype them to mean.
Well, to be fair, I guess some of the blame goes to the scientists themselves, who write their press releases in those terms to make them sound all exciting to the public, because talking about phase velocity exceeding group velocity doesn't excite the reporters as much as "light faster than light" and thus doesn't draw as much attention and possible funding opportunities to the place where you work.
