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I put the cobra with the RFX-75 back in the tractor last night with a good piece of coax and that solved my problem of the garble to the cheap coax floating around during transmission. I also think the skythumper with its high impedence was causing most of the back ground noise in the cobra RFX. I used my Asatatic 636l and I was able to turn the mic gain all the way up; but on the skythumper I had to turn the gain back to 1/2 or my buddies said it picked up too much back ground noise like there was a fan blowing behind me. Overall I think this is a great add on to any of the applications possible; it definitely added some power to the radio but has it draw backs. The swr warning light on ones that have them will most likely have to be trimmed to the off posistion; because when modulate at any level above a regular tone it comes on with my dummy load and it dk=15 and swings to about 80w. It comes on easily with my SRA-158(ceramic mic element) and fairly easy with my Astatic 636l and with my RK-56 it still came on. If you have a set-up with a low swr(which is ideal) and you can get most of the power out rather than reflected you could run into the warning light. But if the swr is a little higher around 1.6-2.0 and your not able to realize the numbers close to 40-80w pep then the light might not come on. Another draw back is the heat; so keep a fan on it if you intend on inclosing it in a box or something similiar. It did pretty well and had a lot more power than a well tuned cobra 29, and even more so that my general lee without the echo on the cobra was more powerful. I am going to install an echo board next and then run it against my general Lee and I am almost certain it will beat the genreal. If anyone would like me to post pictures of my install let me know and I will try to post. I hot glued all parts down and hot glued the wires from the RFX through the 3/8 hole so it would not vibrate and cause the wires to chaffe and cause it to short out. Anyone have any questions let me know.