The reason I ask is because what you did, you cannot "fix." Antenna wire is similar to cable tv wire. They have center conductor and a mesh like outer conductor separated by a dielectric. Even if you managed to splice the two conductors back together, you greatly increased its resistance, ruined any canceling affect the mesh conductor would have had, among other problems. Long story short, an attempt to fix it would result is decreased antenna performance.
As for the poor signal from extending the wires, it is expected. Antennas, although they look simple from the outside, are designed very carefully. This is another reason why I discourage people to use the Perrin Shorty Antennas unless they're okay with losing some reception.
The mod itself looks great, but I don't recommend others to cut their antenna wire unless they understand what they're doing.
"We live for a good time, not a long time."
RIP Colin McRae