Join Date: Jan 2008
Location: Ste-Rose, Laval, Canada
So if I understand well, looking at the plot above for the CM4221:
is my following assessment correct:
1- if the antenna is directly pointed toward the tv station, channel 20 will experience about 2.5 dB less gain than channel 60
2- if the antenna is off axis by 30 degrees left or right, the CM4221 performs about equally well for all channels, however the penalty is about 5 dB because it is off axis at 30 degrees
3- for any signal coming from the back, there is about at least 20 dB penalty, although channel 60 seems to be less penalized than lower channels if the signal is coming from the rear left or the rear right.
now my question is: looking at the plot, how can you tell the gain of the CM4221 vs 4228 etc. when the manufacturer advertise that a given antenna has a 10 dB gain for example?