There are a lot more sources for own root roses:
Ashdown
Vintage Gardens
Antique Rose Emporium
Chamblee's just, to name a few.

How big? Repeat bloom or is once-blooming OK? Any color preferences?

An insistence on own-root might warp things in ways you don't expect.

However much I love roses, I would want something dense and evergreen to screen out a road. Then I would plant the roses in front of the evergreens.

How rustic are the roses allowed to be? For obvious reasons I would never, ever recommend R. multiflora, but if you don't mind a bramble look, you might want to consider R. eglanteria. It's leaves smell of apples even when it's out of bloom, but it's definitely the kind of rose that reminds you that roses are briars.

Another possibility might be Rosa x alba (semi-plena or maxima). Its form is still informal, but more refined than R. eglanteria is.

I like Harry's idea. Plant a row of Arborvitae then plant roses in front. Albas would look lovely or Gallicas or maybe Father Hugo or Rose rubifolia, with its dark purple leaves in front of a bright green hedge. Yeah! That would work.

Barbara

Rugosas Sarah van Fleet, Harrisons Yellow, Glauca, Carmenetta...Hibernica 7 to 8 ft tall and wide Alba Maxima semi plena, Me Merriles, Catherine Seyton.
John Davis is a big beauty with repeat

Call up Nick at Heritage Rosarium in Maryland. He'll know exactly how large plants grow in your zone, and he'll know all about any disease issues in your part of the world. This is a tall order: tall, fragrant, as evergreen as possible, and hardy. How tall do you need? I suppose you want blackspot and disease resistant roses. Hopefully Pennsylvania growers can comment on the blackspot resistance of these roses. Then there's the whole issue of Rose Rosette Disease and multifloras.

In your zone, the best roses for this work are probably species crosses and species hybrids. Most will only bloom once in the spring. Many are reasonably hardy, vigorous, and large. The red Rosa moyesii and hybrid moyesii's are an obvious choice, things like Geranium, Highdownensis, and Eos.

A number of Albas are really tall, like small trees, fragrant, but only once-blooming. Blanche de Belgique is a good choice. Chloris is another. The damask Celestial can get large, tho not huge. Mme Legras is another choice.

A few Hybrid Musks will also do the work. Darlow's Enigma will do the job, with small white flowers and good hardiness. Same with Trier and Moonlight. I don't get great rebloom. Ballerina can grow over time, although mine is only 4 feet tall but 8 feet wide. Propped up against something else, it might get tall enough. Plaisanterie, if you can get it, would probably do. Since these are hybrid multifloras, the RRD issues comes into play.

Some kordesii's will work: Dortmund and Illusion come to mind. Not much scent but great hardiness.

Last, a number of climbers can be grown very upright. Aloha comes to mind immediately.

Here is a link that might be useful: Heritage Rosarium, Brookville, MD

I would recommend:
Darlow's Enigma
Alba Semiplena
Alba Maxima
rosa Primula
rosa Hugonis
Cantabrigiensis
Canary Bird

Trier, Ballerina, Chloris, Celesiana, hybrid moyesii's and Plaisanterie can have a lot of BS and defoiate or look ugly here based on my experience as well as what I can see in other people gardens around here, so I would not recommend them for PA.