[Android Head-Units] SkyBeam2048:
Unfortunately I don't think it's that easy.

First of all in 99% of the cases bad reception is a caused by poor antenna setup. The DAB sticks themselves have a very minor impact on reception quality.

But let's get to some basics. There are passive and active antennas. Active antennas do amplify the signal directly at the antenna and send amplified RF signals to the head unit. Some setups also use passive antennas and use amplifiers within the head unit or dedicated amplifiers in between the antenna and the head unit. Having said that you usually want to have some sort of amplifier. As far as I know the MTCD/E units do not have bulit-in amplifiers so you want to have either an amplified antenna or external amplifier.

In most cases the antenna itself is amplified and you can tell for sure that it is when it has a dedicated power connector (usually 12V feed). So you just need to connect it to 12V (usually you can hook it up directly to the blue 12V AMP line on MTCD/E units).

Now it's getting a bit complicated: If your antenna does not have a dedicated power line it might still be powered. The power might be injected via the antenna line (12V feed to the antenna line). This is called phantom power. For such antennas it's hard to find out whether they are powered or not. You might require disassembly or find a manual. Moreover MTCD/E units cannot inject power to phantom-powered antennas so if your factory head unit phantom-powers the antenna you need a dedicated phantom-power injector. This is a small box which takes 12V and injects the power to the RF antenna line to power the antenna. It's hooked up in between your head unit and the antenna.

Having clarified the power you might get good FM reception but still bad DAB reception. Why? Because your antenna might not be optimized for DAB reception. DAB uses a different frequency range than FM radio. Typically DAB Band III is used which is in the 174MHz-240MHz range (as opposed to FM 88-108MHz). DAB also uses L-Band (1452-1492MHz) in some countries but this is rarely used and due to the frequency only used for local stations usually. Now you need to know that an antenna is not just able to receive any frequency range. It needs to be "adjusted/built" for a certain range. So if you have an FM-optimized antenna built for ~95MHz it might not perform well at 220MHz. Moreover we are talking about amplified antennas which usually also attenuate frequencies above/below the desired range to minimize noise. So your stock FM antenna might actually attenuate rather tan amplify the DAB frequency range if it's not explicitly built for this range.

So for example in my car I had a powered antenna and I got great FM reception on MTCE unit when powering it. I also got DAB reception but obviously the signal was weak/noisy so in areas with good reception (high signal-to-noise margin) I got perfect reception. But the signal almost instantly dropped out almost in every village in between buildings. There is nothing the head unit or DAB stick can do against as the SNR (signal-to-noise ratio) was too bad to detect the signal.

I finally ended up replacing the roof antenna with one dedicated for DAB and +20dB antenna gain. And what should I say... it's a HUGE difference. Now I get perfect reception even of channels I did not receive at all before and I never lose signal inside villages/cities.

Most people do not believe it but when it comes to reception it's all about antennas only. Do not waste your time tuning your head unit or DAB stick. Change your antenna!

If you don't believe it try to get a powered inhouse antenna from your closest radio store, put it up on the rooftop of your car (yes, outside, not inside or at the glass) and make sure it's powered and notice the difference.

Some of those USB DAB sticks come with a short thumb-antenna. You can also try to put this on the car rooftop to try. However those antennas are pretty bad and non-amplified usually too.

If it's not your car or you cannot modify it consider buying one of those antennas clipped to the rear door windows. But don't waste your time with those glass-mount antennas or trying to keep the stock car antenna if you're not 100% sure it does actually also amplify the DAB frequency range!