AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/hamg-g9c04

For the same antenna, how does gain in dBi compare with gain in dBd?

Start playing free

  1. Gain in dBi is 2.15 dB lower
  2. Gain in dBd is 1.25 dBd lower
  3. Gain in dBi is 2.15 dB higher

🔒 The answer is for AhaBulb members. Members see the answer, why it's right and the official sources for every card of Stuff Every General Class Ham Should Know, plus timed practice exams.

The first 50 cards of every test are free to play.

Play the free cards See membership

Like this card?
Play the game

References

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf Checked 2026-10-11.
  2. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf Checked 2026-10-11.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Ham RadioAbout how many dB represents a factor of two increase or decrease in power?Ham RadioWhat percentage of power is lost when a circuit has a 1 dB loss?Ham RadioIn what units is RF feed line loss usually expressed?

That's stuff everyone should know.