Good for you!

Easy fix on the antenna for your weather radio. Make sure you have one that gets am/fm broadcast also.

Use stranded bare copper drop it down through the vent into the shelter. On the outside you can string as much as you need, either to nearby tree on bury it a couple of inches in the ground. The more you have outside, the better signal capture you have. You can find it at Radio Shack.

Attach an alligator clip to the inside end and just clip it to the anntena on
the radio. Problem solved.

As far as the other goes:

3 bottle of water per person per day is the rule of thumb.
biodegradable toilet paper
spare batteries for the radio/flashlights/cell phones
Light sticks-these things are cheap and amazingly bright
first aid kit large enough for 6 people
Extra clothing
Rain gear for each person
2 coils of nylon rope, 50 foot each
Tools-Hammer,small hand saw,pliers,screwdrivers and a large pry bar.
blue poly tarps, 2 10x10 and 1 10x12 (these are cheap and useful)
Containers to carry water. Minimum 5 gals. One for drinking. One for other use.

Food: Then general rule is 1500 calories/day per person. Take it from there
Mre's are great as are many of the other types that are now available.

Medication: Most people forget about this. Anyone in your family dependant on prescription meds? Plan ahead. Diabetics can get insulin pens that no longer require refridgeration now. Put together a Go-Bag just for this purpose.

And of course whatever weapon(s) and ammo you desire.

Hope you never have to use it. But being prepared is just part of the whole thing. Have a plan in place and make sure everyone knows it.

Hope some of this is helpful.

__________________
Take your time..quickly.