Plain-language answer: A current balun drives equal and opposite load currents while impeding common-mode current; a voltage balun primarily forces equal voltages relative to a reference.
Why it changes the result
Current balance is usually the important feedpoint goal because unequal current lets the feed line radiate and alters the pattern.
What to verify
Check topology, ratio, common-mode impedance, frequency range, power, and load conditions—not only the word balun.
The common mistake
Assuming every 1:1 balun is the same device.
Complete-system boundary
Match the exact radiator, feed system, return path, frequency, height, orientation, and environment. Connector or thread fit does not establish electrical compatibility, structural capacity, or safe operation.
