|
Typically, the bigger the antenna, the more directional it becomes. Think of it as the 751 is like a floodlight - the 7696 is more of a spotlight; the spotlight will have longer reach, but it's more about where it's pointed, not a wide area.
What you need is more gain. A bigger antenna will have that. And if you check out some good antenna websites, you'll find the specs on the antennas being sold. A gain chart is what you are after. Every antenna varies in how much gain is has for a given frequency. So if you can find those numbers, you can see which have more gain on the channels you are having issues with. Just be sure that you are looking at the Real Ch # - not the virtual #'s - when you compare. Some gain charts will show frequency and others will show Ch #'s. You can map those with a table of frequency and channels; ie, Ch 14 = 470-476 MHz. So given that, you identify your problem channels and start checking out gain charts to find the best performer in that range.
The 751 has a couple of small elements there on the front. Those are for UHF. The longer rod elements at the back are for VHF. So to get more UHF gain, you need more UHF elements. Sometimes you'll see a corner reflector just behind the UHF elements to help boost that reception. The HD7696p has all of that. If you look around, you'll see various versions of the HD76xx antennas for comparison.
The CS2-V is a design that's different from the types you're looking at now, obviously. It's primarily a UHF by design with a reflector. The V adds an element for VHF reception.
|