As to the OP's question, gain is referred to as gain as compared to an isotropic receptor/radiator (dBi) or over a dipole structure (dBd). A dipole structure has 2.15 dB gain over an isotropic receiver/transmitter. Thus when comparing antenna's listed in both ways take this into account. i.e. an antenna listed as having an 11.5 dBi gain is comparable to an antenna having a gain of 9.35 dBd.
Your current antenna with 7.2 dB of gain doesn't sound very impressive - especially if it's rated as dBi. Run a TVfool report for your exact address and antenna height and see what you're actually dealing with first. Chances are you have some signal out there...
Last edited by aka.Hooper; 06-21-2009 at 12:51 AM.
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