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What is the effect of connecting two omni antennae to a single receiver? The antennae are not close enough to inter-react and operate at 433Mhz at low power.
Thanks
It probably won't work as well since there will be destructive and constructive interferrence between the two antennas, and the impedance also will no longer be matched.
Truckers often have two dipole whip antennas, one one each side of the cab, connected to their CB radio. The antennas are apparently tuned or have a matching network so that they provide the proper impedance to the radio. The two antennas generate a somewhat directional beam to the front and back which gives them greater range to other truck radios (which are likely located down the road in front or back of them).
I understand your skepticism, there's a lot of electronic snake oil out there. Here's an article which suggests that, depending upon the antenna spacing and with proper coupling and equal cable length, there will be some directionality.Most likely, nothing more than a marketing ploy, at best it would add signal loss to the system. Then again, I could be wrong but I remain skeptical.
Not only will two antennas create a 2:1 impedance mismatch or worse without a splitter or some other matching network; the phase delay of the two signals arriving at the mixer (Depending on antenna spacing) will create unwanted mixing products. Question is, why would you want two antennas?