Antenna Improvements, GP Oregon

[johloh]

I believe I am picking up all the channels in my area that I should be...unfortunately two of the channels are coming in a bit spotty. if you follow the link below they are highlighted in yellow. The antenna I'm using is a homemade 4 bay bowtie that I have mounted to my roof. I know all my channels are UHF and that this should be a good antenna for UHF.

I did notice that the two I'm picking up the worst are 15 and 19 and that also happens to be the closest to the VHF spectrum. is my antenna centered two high into the UHF and having trouble picking up these low channels?

Is there another homemade antenna that might lower its pickup range a bit so I can get those two channels better?

I'm not looking to spend any money and I actually enjoy building antennas myself, any advice?

Here is a link to my spreadsheet for tracking channels in my area. its a combo of info from tvfool and rabbitears.info...

https://docs.google.com/spreadsheets/d/1u-3rw59kuReItBHkKNoEgSWJADd-ZFhkGQBi8aqc_Nc/edit?usp=sharing

Here is my tv fool link...

http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3de1c6a946f95646

[johloh]

also bonus question, the only station in the area that shows giants games is my 48 kfbi , a fox affiliate that is I believe 48.3 and 48.4 but is kinda far away from me. well its probably only about 20 miles away but its mountainous terrain.

http://en.wikipedia.org/wiki/KFBI-LD

rabbitears.info shows grants pass as on the edge of its range.

http://www.rabbitears.info/contour.php?appid=1338650

is there anything I could do to pick up that channel? a single wire length designed to pick up just that single station?

[teleview]

+=>

The tvfool report is not showing any antenna height above ground.

Do Not Delete the tvfool report that is not showing any antenna height above ground.

Please Make and Post 3 more tvfool reports , 25 , 40 , 60 , feet above ground.

[Flint Ridge]

What "build" did you use to create your antenna?

Do you have any spec's on it?

Below is a site with plenty of builds with real data behind them. I've built a customized version of this one and am working on another version stacked.

http://clients.teksavvy.com/~nickm/gh_u/gh10_15u15.html

And another site. Again with strong data behind them.

http://imageevent.com/holl_ands

With that said, it would be helpful to have more information on your current setup. Such as antenna height (could you run at actual height and maybe =20' and =40'), don't see where that is input. Age/condition/length of coax, number of splitters and TV/tuners on it?

Curious as to the KFBI channel and why it is not on the TVFool, it maybe totally unobtainable.

[ADTech]

You need to look at the LRI plot for KFBI, not the contour diagram. See http://www.rabbitears.info/contour.php?appid=1338650&map=Y

It's a mere 250 watts ERP. Very local coverage unless one happens o be on a ridge line or mountain that faces the transmitter. Unfortunately, that's not your location.