One thing that everyone has missed is that DAB is vertically
polarised. Thankfully all FM transmissions in the UK are now of
mixed polarisation (i.e. they have both horizontal and vertical
components) so turning your FM aerial vertical (if necessary)
will not be a problem (electronically - might be physically!)

As others have said a simple single half-wave vertical VHF dipole
is the best as (a) it is just about a full wave at DAB
frequencies so will work albeit with a mismatch and (b) it is
near enough omni-directional so will not limit you to your source
Tx station.



--
Woody

harrogate three at ntlworld dot com