I think the Nokia 6256i or some version of like the 6255i can be used on Alltel. I have the Nok 6256i on VZW and it has analog capabilty. The Mot 710 might be a good choice IIRC that handset can be used on Alltel.
The Audiovox/Toshiba 9500 is my choice of handset when camping in analog land, mostly because I can still activate it on VZW, since it has the 911 capabilities and MOST IMPORTANT it can be hooked up to an external Yagi/omni antenna. I can't tell you what a huge difference it makes to hook a handset to a 9db Anntenex Yagi! I use the debug screen to aim the Yagi at the source tower.
The Nokia is OK but the is no RF connectivity in the antenna adapter sold, which connects into what is a test port on the back and not a regular antenna connector as found on older Nokia. Wilson says theirs works, but I have no personal experience of this being true. Perhaps an external connecter that attaches to the antenna may work?
Motorola may be the best bet for external antenna connectivity.
A welded 3' pro grade, Antennex Yagi holds up to being packed into the trunk. An aluminum swimming pool handle makes a great antenna mast. I only had to cut off about 6" to get the collapsed mast/swim pool handle to fit into a small 4 door car. I glued a short section of PVC tube inside the aluminum pole, near the end, to keep the tubing from collapsing when the antenna mount is tightened up. A 3-4' section of electrical conduit fits inside the base and allows for rotating the mast to find the best signal. I drilled a couple of holes in the Conduit to attach to either my hitch mounted bike rack, or to pound a couple of lag screws into any suitable stump, to mount the mast away from the car.
Use thick low loss (more expensive)cable since thin cable will tend to lose much more signal
While driving a 3 db omni works OK but is marginally better than standing outside the car. Since the higher the db rating of an antenna squashes the signal radiation pattern more towards the horizon/horizontal, when traveling in the mountains use a 3db. A higher db antenna may miss the source tower if it's mounted high on a hill. For flat topography reception a higher antenna db rating can be used.
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Sid