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Originally Posted by butchyday
i recently bought a "quantum fx ant-105" have it about 30+ feet and only get limited pbs channels. what can i do?
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Based on some pictures found on the web, this antenna does not appear to be a very sensitive one. If I had to guess, I'd say that this antenna is probably only good for UHF stations within 25 miles. VHF performance may be even more limited or non-existent.
If you could generate a TV Fool signal analysis for your exact location and post the link here, it would help us determine whether or not this antenna is appropriate for your situation or not.
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does the ant need to be at certain heights like the old analog antennas? if i remember correctly intervals of 7 foot. i have a few stations within 60 to 70 miles i'd like to get. any advice would be great.
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There is no "magic" height for antennas. It is true that some channels will get stronger or weaker at varying heights under the right circumstances (signal reflections off the ground and other objects). However, this effect varies with the wavelength of the channel. What works well on one channel might make things worse on another.
In most situations, the effect is small and can usually be ignored. If you have a specific problem channel that cannot be fixed in any other way, then it might be worth experimenting with changes in antenna height.