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You should use Access point (or router, which can be switched to this mode). 
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thinkpads_user: The existing router is wireless, and what I need to do is to get some reliable wireless in to the apartment. It sounds like I would have to run another cat 5 cable in to the apartment if I use your configuration, and I want to put in-line on my existing cable just before it goes in to my computer.
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Hello donno46 - your diagram already says it has a CAT5 cable in place and you only need one. <br />
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Plug the house end into a LAN port of the house wireless router (there must be a LAN port available). Plug the apartment end into a LAN port on the new wireless router (not the WAN port). The new wireless router will have LAN ports as well. Now set it up as I noted. Turn off DHCP on the new router, give it a static address on the old router and it all should connect. <br />
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You do not need a second ethernet cable. ... Thinkpads_User<br />

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OK, but can I then use a patch cord to go from the new router to the computer &nbsp;that is currently using that cable?
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Yes, of course. Once set up, you can connect an ethernet patch cable from a LAN port on the new wireless router to the computer. I assume that your wireless routers have 4 LAN ports. All the ones I see do. <br />
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... Thinkpads_User<br />

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OK, I may need to accept multiple solutions, so I'll pick up a router and see how it goes. May need to use Dave_Baldwin's solution too.<br />
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I'll be back in a day or 2.
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Thanks. I know there are multiple ways to do things and whatever way works for you is fine with me. I like one single subnet when all complete because that works well for me. ... Thinkpads_User<br />

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And I set mine up as multiple networks cause that's what I needed.
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Between Dave and Thinkpad, I think that I have all the answer I need
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You are most welcome and I was pleased to assist and I alway enjoy reading an expert's point of view as well. Thank you. ... Thinkpads_User<br />

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You're welcome, glad to help. &nbsp;I'm really here to learn what I can, answering questions is the best way to do that. &nbsp;Makes me try to figure things out.
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The aluminum faced insulation in my in-law apartment is preventing me from getting a good wireless connection when I need to use my laptop. Sometimes it works, but usually doesn't, or gets dropped. I have a cat5 cable run from the router in the main house in to the apartment, and I am thinking about getting another wireless router and hooking it up to just before it goes in to my computer and then using one of the ports to hook the router up to my NIC as shown in the attachment. This should solve my wireless problem if it's possible to do.<br />
<a href="https://filedb.experts-exchange.com/incoming/2011/07_w29/477302/router.jpg" target="_blank" class="file-inline" title="diagram (63 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>router.jpg</a>
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router.jpg

The aluminum faced insulation in my in-law apartment is preventing me from getting a good wireless connection when I need to use my laptop. Sometimes it works, but usually doesn't, or gets dropped. I have a cat5 cable run from the router in the main house in to the apartment, and I am thinking about getting another wireless router and hooking it up to just before it goes in to my computer and then using one of the ports to hook the router up to my NIC as shown in the attachment. This should solve my wireless problem if it's possible to do.

Can I add an in-line wireless router to my system?

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.