Oh.. I will say this. I've read many folks brag how well this or that antenna works... And depending on where you are parked they are all right believe it or not.
The Winegard Sensar IV (Built in Wingman) I have is the best LONG RANGE RV antenna from what I can find out.. Now a amplified Home type antenna on a tall mast may well be better (more on that later) but in terms of an RV antenna. None better made that I've found.
An electronics type here in the forum compared it to the JACK antennas and it was the hands down winner (I think he used a Sensar III with wingman)
Jack however does better of you are closer to the towers as it has a wider field of vision.
Think about sitting in the nosebleed seats at Detroit's Masonic Temple looking at the ant size actors on stage (Phantom of the Opera) (Been there done that)
Well you grab a pair of "Opera Glasses" (Low power binoculars) and you are visually somewhat closer Say 1st Balcony. (Nosebleet seets are 2nnd or 3rd forget which. also known as "The Gods" cause you are way nearer my got to thee)
You grab a good pair of FIELD Glasses (Higher power Binoculars) you are now sititng on the main floor visuall but.. YOU CAN NO LONGER SEE THE ENTIRE STATE.
Same with TV antennas. The farther they see. the narrower the field.
As for putting an antenna higher up
Once was using my new hand held 1 watt into a little "Rubber duck
flexible antenna radio to talk to some other ham radio operators via a repeater many miles away.. That antenna has "Negative gain" I"m guessing my effective power was in the quarter watt range.
Another ham not far from me. attempted to join in running 10 watts with 6DB gain (effective 40 watts) at 30 feet.. He did not make it.
He had 160 times the effective power and he did not make it
I was close enough to see him
I was also about 250 feet above ground on the top floor of a skyscraper.