ferrite vs sensitivity


The sensitivity of my ICF-S5W and ICF-EX5 with their 6.375" bars is the equal of my PR-D5 with it's 8" bar. If constructed properly, should there be an expectation of greater daytime sensitivity with an 8" bar in a radio, or is it like a calculus problem where we are already approaching the limiting case with a 6.375" bar?
On another topic concerning EX5 vs S5W, I had assumed that the S5W had greater raw sensitivity. With experimentation just a few miles further away from the mw rf jungle in my area (largely related to the abundance of Nuevo Laredo mw's in addition to Laredo's stations), the two sets appear identical as far as usable sensitivity. If the S5W is more sensitive, the EX5 seems to counter with a lower noise floor. The rf jungle and relatedmixing products are so intense that (on all of my radio sets including the Grundig G3 with ssb and sync options, and the Tecsun 390 with it's 1 KHz filter) only mixing products are heard on 1230 KHz, yet 4 miles down the road, Corpus Christi is heard on that frequency in comfortably listenable fashion.

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