Advertise in Eastern Washington and Northern Idaho on billboards located in Spokane’s Airway Heights and Post Falls near Coeur d’Alene. Parker Outdoor is family-owned and one of the Northwest’s most experienced out-of-home (OOH) billboard advertisers, bringing to our clients more than 30 years of expertise in the industry. Parker offers personalized service, prime sign locations and graphic design assistance that will impress your target customers. Our ad copy is digitally printed on durable vinyl and comes in a variety of poster and bulletin sizes to meet nearly any advertising budget.