Ladder Line or Coax For Reception only?


I have a 500 foot SkyWire Loop Antenna, about 30 feet off the ground
and I have it fed with Coax. I will only be using it to receive
Shortwave broadcasts from 2Mhz to 30Mhz. It will never be used to
transmit.


My questions are :

(1) Will using a Ladder Line instead of Coax improve my reception?

(2) If so, where do I change to coax? Or do I just run the Ladder line
into the house and straight to the receiver?

(3) What about electrical interference since the ladder line isn't
shielded?


Thanks.