Avoid the temptation to use an amplifier without first considering whether it will be overloaded by the many strong signals your 'blessed' with.
If the attic and roof construction is of wood and composite shingles, you should expect good results. If you have tile or metal in or on the roof, plan on an outdoor mounting.
An
Antennacraft C290 and
Antennas Direct CPA-19 preamp in a ventilated attic (high heat kills powered electronics) will work fairly well as long as the attic construction does not cause more than about 10dB of penetration loss. If you mount in the attic only to find you've got poor results, the Antennacraft can be refolded with care, and moved outside into the clear. If you know that you're going to mount outside, use a
Winegard HD7015P, it's a bit sturdier but is difficult to refold without damage. Use a starting aim point of about 250° per your compass.
The preamp I've suggested is tolerant of strong signals. If you were only connecting one set, I would not suggest any preamp. The CPA-19 has the gain needed to overcome the losses associated with a 4-way splitter and typical cabling.
When you look at the
specifications of the HDX-1000, the -20 dBd and -6.6 dBd (L-VHF / H-VHF) gain figures are far too low to expect much in your location. The UHF gain of only +6.4 dBd is used up in large part by the poor 3.5 dB NF of the built in amplifier. By the time you have enough signal in the air to use this antenna, most unamplified rabbit ears would perform significantly better.