If there is enough land at the 1170 site, co-location of 1220 at that site might be possible, however. Co-location would not involve any shared towers, but would require enough land to construct (presumably four) new towers and a local zoning board that would approve the construction of those towers.
Enough land? Not a problem.
Here's a composite aerial view of the KLOK acreage, once known as "Radio Park":
http://www.sfradiocity.com/klok/photos/klok-1170_xmtr-site_2004.pngThat's South King Road at the right.
If it's up to a local zoning board ... there might be issues. This was once a vast agricultural area. Now, much like the original KEEN/1370 site on Old Oakland Road (gone for a decade or so) and the longtime site of KLIV/1590 on Story Road, San Jose has grown up around these once-rural facilities.
Remember the difficulty that arose a few years ago when KYCY/1550 (under Westinghouse) (?) tried to move to the Fremont/Milpitas border, near the Bay, then proposed shacking up (their transmitters, that is) with KLOK. I think the response from uppity neighbors was -- and this is not a direct quote -- "Oh,
hell no."
Just a thought: if someone can find the concrete bases where the late-period KQW/early-period KCBS transmitter towers once stood in the picturesque but fragrant Alviso swamps, they might be able to repurpose them...