Amateur Radio Emoji
Many activities, sports, food, and animals all have emojis present in the Unicode standard, but if you want to express amateur radio ideas in the form of an ideogram you will have difficulty. There is the 📻 emoji which represents a broadcast radio receiver, a 🎙️emoji which represents a studio microphone, and a 📡 emoji which Emojipedia suggests could be used to represent a satellite dish used to communicate with 👽.