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Isn't there a built in antenna? Read up on field strength measurements; typically you use a one meter long antenna and then the readings will be direct in microvolts per meter. For VHF that gets a little long, so you can use a 0.1 meter antenna and multiply readings by 10 to get field strength. That's only about 4 inches so your technique is very important. You orient the antenna for maximum reading.
The only purpose of the instrument is to measure field strength; they were typically used to determine station coverage. The tricky part is to identify the station.
There should be a calibrate function; your picture isn't clear enough for me to see.
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