Often this is delivered by an antenna signal is too weak for a proper reception. Then you need a Antennenverstaerker. The spectrum of this wave is about to FM (DVB-T). Here links to proven concepts.

Here you will find Schematic Circuit Diagram for DIY and further information on Antennenverstaerker
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Easier for short-wave amplifier	www.web-ee.com/Schematics/ActiveAnt/Active_Ant.htm
Comprehensive guide for an active antenna	www.darc.de/g/25/pdf/aktivantenne.pdf