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Wikipedia is showing that one of the Repeater/translator stations of KIRO is K26IC-D , Real current UHF channel 26.
http://en.wikipedia.org/wiki/KIRO-TV
The transmitter is in the opposite direction at about 275 degree magnetic compass direction.
To Test for reception.
Aim the XG91 antenna at about 275 degree magnetic compass direction.
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Here is how to aim antennas.
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna , do not trust a , cell phone , tablet and etc. compass.
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Rescan for channels.
Also , Digital Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
http://www.wchstv.comDoubleReScanAlert.pdf.
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If reception of K26IC-D is received OK.
Then leave the XG91 aimed at K26IC-D.
The reception of K26IC-D Will Be a Separate Antenna System known as antenna system #2.
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Antenna system #2 and antenna system #1 , are No Connected Together.
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Antenna system #1.
Install a.
http://www.channelmasterstore.com.
CM4228HD antenna aimed at about 75 degree magnetic compass direction.
Connect a , CM7778 preamplifier.
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Here are some Tuner/Tuner Recorders that connect to the antenna system and Tv.
http://www.epvision.com.
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As always , trees and tree leaves , plants and plant leaves , have a Negative Effect on Broadcast Tv Reception and so do buildings and other obstructions including your own , attic , roof , building , in the directions of reception , East North East , South , South West , West.
Some and not all Negative Effects are.
Absorbing Blocking Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice for Reliable Reception is to install antennas at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own , attic , roof , building.
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As a Test to prove reception of antenna system #2 and antenna system#1 , connect a New continues length coax and run the coax through a open door or window direct to Tv.
Remember antenna systems #2 and #1 are not connected together.
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Here are some antenna mounts that will get the antenna/s up higher.
http://www.ronard.com/909911.html. Install the , ronard(911) , 5 foot tripod antenna mount.
http://www.ronard.com/712.html. Install the , ronard(712-50-10) , 10 foot tripod antenna mount.
http://www.ronard.com/ychim.html. Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224).
http://www.ronard.com.
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http://www.palcoelectronics.com/pe300.aspx.
Light weight aluminum , Free standing , No guy wire , Lay over towers.