DAB radio aerial

Like most services the higher the aerial the better is the usual requirement -- being  the wrong side of that Big Hill can ruin any signal !

We receive DAB signals for our radio through our Status Antenna on our Unicorn 3. Works great, however just like the tv needs retuning every new location...

May be worth a check on unit already fitted!

Aerials on cars and caravans are normally fitted with a preamp to boost the signal so 12 volts will need to be in place to power them. according to the link below the telescopic aerial fitted on some vans works well on DAB

https://www.youtube.com/watch?v=E67eBWANTII

But you will also require the aerial split lead shown in the video

Why not use the TV as a digital radio as loads of stations on digital TV's.

DAB is not like FM, you don't need a twig. Most aftermarket ones are designed to stick to the windscreen of a car in a set position using the A post as a ground plane. You cant easily replicate this in a caravan. 

Putting it on the roof is the best option as a caravan is a big metal box, but the problem with fins or twigs is that they are generally for car roof not caravan roof, they are too short in the threaded section to allow a good fitment to caravan roof. 

Assuming you have something for the TV already fitted then they have an FM feed (usually), and your head unit is active amp type so just try something like: https://www.ebay.co.uk/itm/DAB-DAB-AERIAL-Antenna-DAB-Splitter-In-Car-Radio-SMB-SONY-JVC-Pioneer-KENWOOD/292603042208?hash=item44208019a0:g:2yYAAOSwH71XOYmB

If you don't have one fitted then try something like this on the front window of your van or on the underside of your A frame plastic cover: https://www.ebay.co.uk/itm/Ampire-ANT600-DTT-DAB-Radio-Antenna-adhesive-waterproof-with-Fakra-plug-20dB/232594957077?epid=1033093833&hash=item3627bd6315:g:GPcAAOSwiBJaL9pY

Thanks for the helpful information it has got me thinking. I have ordered a splitter and if this does not help I might try the window type. However I would not like to stick it on a vinyl caravan window but when you mention A frame it made me think what about inside the gas locker as it would be outside the metal box and just shielded by a moulded non metallic body. I will report any success.

just buy a portable digital radio.

https://www.amazon.co.uk/Roberts-Radio-Play10-Digital-Presets/dp/B008VPBDYI/ref=sr_1_4?adgrpid=56171336394&gclid=Cj0KCQjwuZDtBRDvARIsAPXFx3A1Elm9uivmCDdQSMMO2-sssTDjFgJYl5gcMnNjJ_qNEQ7aCfCL5-EaAkJUEALw_wcB&hvadid=259106604396&hvdev=c&hvlocphy=1006727&hvnetw=g&hvpos=1t2&hvqmt=e&hvrand=17270046416831821980&hvtargid=kwd-315818059800&hydadcr=28179_1821130&keywords=digital+portable+radios&qid=1571055402&sr=8-4

I think you will be wasting your time fitting an aerial in that location, you have not said if you already have an aerial fitted to the van,if it has then that will be ok as the splitter will feed the signal into both the Dab and analog parts of the radio plus it will have a preamp to boost the signal 

I also change the radio to a dab 

as long as you buy the correct splitter as below 

Eightwood DAB Aerial Splitter DAB Antenna Splitter Cable SMB Antenna Splitter Din Female to Din Male to SMB Cable Car Radio RG174 30cm for AM/FM DAB+ Radio Pioneer Clarion Kenwood Alpine JVC
by RFSolution
Learn more: https://www.amazon.co.uk/dp/B077GMM5G9/ref=cm_sw_em_r_mt_dp_U_beJPDb9GBP2D5

All will work fine