Radios with FM and DAB+ usually use a rod antenna. However, if there is an aerial socket on the device, there is a combined socket for cable TV FM where DAB+ is also used (cablecom, Sunrise). Or there is a single DAB+ socket. A copper wire with a length of approx. 45 cm can be connected here. This corresponds to the wavelength of DAB+ ( 190 ....230 Mhz )