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At the risk of over-simplifying, yes, a larger antenna is able to gather more energy from the air, so it can deliver more signal power to the tuner. Larger antennas are usually more directional, and will receive less interference from the sides which equates to a higher quality signal at the tuner.
KING is broadcast on real CH-48, a UHF channel. If you're still having trouble with reliable reception of KING or KIRO (real CH-39, a UHF channel) then you need to improve your UHF reception capability. One way to do that is to place your existing antenna in a location with higher quality signal. (Read that to mean, outside the building, clear of obstructions.) Another possible solution, use a more capable UHF antenna... DB4E, DB8E, 91XG, etc.
The Y5713 is a High-VHF antenna that gives you coverage of real channels 7 through 13. Here in the Seattle market, there are four stations operating in that band, K08OU, KCTS, KSTW & KCPQ (CH-8, 9, 11 & 13 respectively). If you are receiving these with an ANT-751 now, you could use the 751 in place of a Y5713.
The UHF antenna can mount on the same mast as the VHF antenna... 3 feet is the minimum separation I'd use.
I have trees to contend with, and am using a DB4E + Y10713 (the larger version of the Y5713) + a UHF/VHF signal combiner. (My TVFR is not very different than yours. When the weather is bad, windy in particular, I can expect the moving Doug Fir limbs to cause some intermittent interruptions to otherwise strong signals.)
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 14-Mar-2014 at 5:27 AM.
Reason: similar reception conditions
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