| Keyword | Most frequent expressions (number of websites) |
|---|---|
| vhf | vhf uhf (4), hf vhf (2), participant vhf (1), vhf certification (1), band vhf (1), coil vhf (1), activity vhf (1), vhf marine (1), vhf manpack (1), vhf draagbaar (1), region vhf (1), vhf contest (1), input vhf (1) |