How to record packet/frames data without a pcap header

I'm trying to capture raw/binary Ethernet traffic from my interface, so I can parse it using C. I don't want to parse any PCAP headers. I would prefer without the preamble and end bytes, but it's okay if it's easier to include. Unfortunately when I capture using Wireshark it always adds a PCAP header. Consequently I tried Tcpdump: sudo tcpdump -w - -U | tee ~/test.raw. However, I open the file in Wireshark, View, Reload as File Format/Capture and it also added a pcap header (see below). How can I record the raw frame + packets without any PCAP information?