What do I do wrong/how can I debug my antenna?

Yepp, both look good:



pi@piaware:~ $ lsusb
Bus 001 Device 005: ID 1d19:1101 Dexatek Technology Ltd. DK DVB-T Dongle
Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@piaware:~ $ top

top - 11:43:22 up  1:50,  3 users,  load average: 0.20, 0.19, 0.21
Tasks: 110 total,   1 running, 109 sleeping,   0 stopped,   0 zombie
%Cpu(s):  4.1 us,  0.8 sy,  0.0 ni, 95.0 id,  0.1 wa,  0.0 hi,  0.1 si,  0.0 st
KiB Mem:    948016 total,   269548 used,   678468 free,    74012 buffers
KiB Swap:        0 total,        0 used,        0 free.   111336 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                              
 1585 root      20   0   25480   6684   1708 S  16.8  0.7   4:55.41 dump1090                                                                             
 1649 pi        20   0    5108   2516   2164 R  11.2  0.3   0:00.06 top                                                                                  
    1 root      20   0    5476   3908   2740 S   0.0  0.4   0:05.24 systemd 


My antenna is just this little thing that came with the dongle: amazon.de/dp/B009HR8D38